The purpose of mechanical ventilation, is to provide the optimum amount of fresh air into the building and remove the polluted air from the property. Unlike natural ventilation, the mechanical ventilation is characterized by the ability to regulate the amount of air supplied to the building regardless of weather conditions and the user, has influence over its intensity. The advantage of the mechanical ventilation system, is the possibility to use heat recovery, minimising heating costs and definitely improves the air quality and comfort.


PE-FLEX® Plenum boxes are used to connect PE-FLEX® ventilation pipes with air diffusers . We offer plenum boxes made of stainless steel and policarbonate. They come in various connection combinations and all have sockets ,used to connect ventilation ducts with built-in gasket and Push-to-Connect assembly. This guarantees fast and simple installation of plenum boxes. The boxes allow the mechanical ventilation assembly- both on the ceiling and directly on the floor.

  • Plenum boxes are made of very resistant policarbonate and have ergonomic design; the body of the box is only 6 cm high.
  • They can be installed in the insulation layer of the floor.
  • Polipropylene sockets enable fast and simple installation of PE-FLEX® ducts -just insert the pipe until you hear a "click"
  • The gasket built into the muff, ensures high tightness of the installation
  • The plenum boxes come in two versions - ceiling and floor mounting.
  • They have handles, that facilitate the assembly of the boxes
  • Available in male connector version-nipple (to extend using a moulder) and female connector version-socket (for direct connection to the air valve's frame).
  • Available in three versions: 5 x Ø50 mm, 2 x Ø75 mm, 3 x Ø75 mm and 2xØ90 mm.

varieties of plenum boxes made of policarbonate

Floor mounting plenum box

It allows
to distribute the installation in the insulation layer

The height of the box 2x75 and 3x75 is just 88 mm

Ceiling mounting plenum box

It allows to mount
plenum boxes
and distribute
the installation on the ceiling

The ceiling has to be lowered only by 100 mm for 2x75 and 3x75 plenum boxes

socket box

for direct mounting of the diffuser

It enables to mount
the air diffusor's frame directly to the plenum box

The inner diameter of the plenum box stub pipe is 125 mm

Nipple plenum box

for extensions

It allows to extend
the stub pipe of the plenum box

The outer diameter of the stub pipe is 123 mm

Plenum boxes assembly

Gaps formed between the opening in the ceiling and the extension should be sealed with mounting foam


The plenum boxes can be mounted on the floor in the insulation layer.

The minimum isolation thickness for Ø75 mm pipes is 8 cm and 5-6 cm for Ø50 mm pipes.


Whenever the ceiling is lowered by more than 10-12 cm, a special extension for male connector plenum box needs to be used.


How to install PE-FLEX® ventilation ducts into plenum boxes?


Before the pipe is inserted into the stub pipe , the pipe end needs to be evenly cut by means with a special knife.


Thanks to the stub pipe's inner built-in gasket, there is no need to place a separate gasket on the pipe.


The neatly cut ventilation duct needs, to be inserted into the plenum box's stub pipe until a "click" sound is heard!


The remaining PE-FLEX® ducts need to be mounted into the plenum box the same way.


In the PE-FLEX® product range, there is a wide variety of plenum boxes made of stainless steel. All the plenum boxes contain sockets made of polipropylene with Push-to-Connect assembly. They are adapted to be used with PE-FLEX® ventilation ducts of the following dimensions: Ø50 mm, Ø75 mm and Ø90 mm and they enable to connect the air valves of the following dimensions: from Ø100 to Ø160 mm.

Types of plenum boxes:


Location of plenum boxes and air diffusers

The location of supply air diffusers , should provide ventilation of the rooms in their whole cubic capacity. The air supply can be applied from the floor, ceiling or wall. The most effective way is from the upper area of the room. The extract air diffusers should also be placed in the upper area of the rooms (wall, ceiling). Such location of the supply and extract elements will provide proper air circulation in the room.

lokalizacja anemostatów

Location of the supply air diffusers

  • It is convenient to place the supply air diffuser at a distance from the door and extract air diffusers, so that the whole cubic capacity of the air in the room could take part in the air exchange.
  • Diffusers should not be installed directly above the place where people reside , e.g. above the bed, above the desk, above the sofa, so as not to cause discomfort resulting from the perceptible contact with the blown air (especially in winter)
  • The air diffuser should not be mounted above the furniture, so that the air coming into the room moves freely.

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Location of extract air diffusers

  • The extraction air diffusors should be placed close to the poor air sources
  • In order to equalize the supply and exhaust air flow, additionally provide an exhaust system in places that will help in the good organization of the circulating air, such as communication rooms (e.g. hall, staircase)
  • The extraction elements, need to be mounted in accordance with the ventilation system concept
  • The extract air diffuser, should not be placed above the gas/electric cooker. This way, we will avoid having the greasy vapours inside the installation.
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Frequently asked questions

How high is a stainless steel plenum box?

The height of manifold and plenum boxes made of stainless steel , equipped with polypropylene muffs depends on the version:

- Ø50 mm boxes are 59 mm high,
- Ø 75 mm boxes are 83 mm high,
- Ø90 mm boxes are 100 mm high,

How high are the polycarbonate plenum boxes?

The height of the body of the boxes made of polycarbonate is 60 mm and this is the total height of the boxes with Ø50 mm muffs . The body in the Ø75 mm boxes is the same, but the connection muffs for PE-FLEX pipes are 88 mm high..

I would like to make plenum boxes under the ventilation grate- is it possible?

It is possible to produce boxes under the ventilation grate. You should then create a box in the BOXMAKER program and additionally send us the exact installation dimensions of the ventilation grate or send the grate itself to the following address: Gdów 685, 32-420 Gdów. After measuring, the grate will be sent back along with the ordered boxes.

I have a 25 cm thick ceiling - do I have to buy an extension for the boxes?

the standard length of the stub pipe in stainless steel plenum boxes is 53 mm, and in polycarbonate boxes 40 mm. The purchase of extensions is therefore required, for quick and convenient installation

How do I fix an extension in a polycarbonate plenum box?

The extension can be mounted by pasting it with silicone or silicone glue. To do this, apply sealing agent to the stub pipe of the nipple box and insert the extension. To strengthen the connection, you can additionally screw in two or three self-drilling screws (so-called sheet metal screws) around the perimeter of the extension, at the level of the stub pipe's nipple box.

Do I have to buy gaskets for the boxes?

Not. All plenum and manifold boxes in the PE-FLEX® offer, have polypropylene muffs with built-in gaskets and CLICK assembly. Additional seals are not required.

Which plenum boxes to buy - stainless steel or polycarbonate?

These boxes can be used interchangeably, without affecting the operation of the ventilation system. Polycarbonate boxes are cheaper, while stainless steel boxes are offered in a wider range. All of them have muffs with a built-in gasket and CLICK assembly.


The primary element of the PE-FLEX® ventilation system are the PE-FLEX® ventilation ducts made of the first class PE-HD material. The double layer PE-FLEX® ventilation duct with smooth inside layer, is intended for connecting the distribution boxes with the plenum boxes and for transferring the ventilation air. In order to provide additional protection, the PE-FLEX® ventilation ducts have the inner layer which contains antibacterial, fungicidal and antistatic additivesDucts come in two variants Standard and Spectra 1000.

  • They are made of the high quality PE-HD material, which provides the complete hygiene of installation.
  • Ducts are available in two variants: Standard with biocides up to 60% and Spectra 1000 with almost 100% protection.
  • The outer notches provide flexibility and high durability of the pipe, and its smooth inner layer minimalizes air resistance inside the instalation and enables to clean the ducts.
  • The closed air gaps in the duct circuit, to a great extent suppress the noise caused by the air moving inside and they also provide the thermal isolation.
  • The strength and excellent flexibility of the channels, allow for a very universal distribution of the installation in the house, e.g. by placing pipes in the ceiling insulation layer or in the suspended ceiling.
  • They are available in three diametres - Ø50 mm, Ø75 mm and Ø90 mm.

An example of how to install ventilation system


How to install PE-FLEX® ventilation ducts?


Plenum boxes and ventilation ducts are mounted directly on the ceiling .


The installation is hidden in the ceiling insulation layer , e.g. styrofoam, which should be at least as thick as the diameter of the duct.


It is a good practice to provide a thicker layer of ceiling insulation , in order to cover the whole ventilation installation


Underfloor heating can be installed directly above the PE-FLEX® ducts - both installations do not conflict with each other.


In order to install the plenum box, a hole in the ceiling needs to be made. From the bottom only the air valve is seen, the whole installation is covered with concrete floor.

Technical specification of PE-FLEX® ducts®

L [m]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
2 13,90 3,03 3,7 11,495 2,5 1,3 9,207 2,01 1,8
4 13,93 3,03 8,5 11,534 2,51 6,2 9,143 1,99 6,0
6 13,84 3,01 17,0 11,562 2,52 10,5 9,262 2,02 10,3
8 13,82 3,01 26,5 11,551 2,52 17,0 9,198 2,00 16,0
10 13,88 3,02 40,7 11,552 2,52 23,0 9,171 2,00 19,2
12 13,94 3,03 49,7 11,585 2,52 30,0 9,145 1,99 25,0
14 13,85 3,02 58,0 11,540 2,51 34,3 9,128 1,99 30,0
16 13,86 3,02 69,2 11,596 2,53 43,2 9,170 2,00 32,2
18 13,91 3,03 82,3 11,575 2,52 49,5 9,102 1,98 37,2
L [m]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
Flow rate
Q [m3/h]
Air velocity
v [m/s]
Average pressure
loss [Pa]
2 35,88 3,00 11,0 29,65 2,48 6,0 23,73 1,99 7,0
4 35,83 3,00 15,0 29,67 2,48 11,0 23,79 1,99 7,8
6 36,19 3,03 17,0 29,66 2,48 13,0 23,77 1,99 9,0
8 35,98 3,01 30,0 29,88 2,50 20,0 23,79 1,99 14,0
10 36,04 3,02 40,0 29,62 2,48 27,0 23,88 2,00 16,0
12 35,89 3,00 45,0 30,06 2,52 32,0 23,72 1,99 20,0
14 35,79 3,00 49,0 30,13 2,52 36,0 23,64 1,98 23,0
16 35,87 3,00 57,0 29,87 2,50 45,0 24,06 2,01 32,0
18 35,48 2,97 67,0 30,1 2,52 52,0 24,14 2,02 31,0

Knife for cutting the PE-FLEX® pipe®

The knife allows you to cut the PE-FLEX pipe very quickly®.

Thanks to the use of a knife, the cutting surface of the ventilation duct is even and smooth. It allows for a tight connection of the cable with manifold and plenum boxes with the CLICK assembly system- Ø50 ; Ø75 or Ø90mm.

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nozyk do rur

PE-FLEX couplings®

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CLICK connector for PE-FLEX pipe.

The only connector on the market for connecting PE pipes with a built-in gasket and CLICK assembly.

The connector ensures high tightness and durability of the connection of two pipe sections. It does not require the use of additional seals or sealing with tape.

The connector allows for a quick connection of PE-FLEX ® ducts with a diameter of Ø50, Ø75 or Ø 90 mm.

4x50 / 2x75 adapters



They allow the installation to be led to places where the use of the Ø75 mm pipe is impossible due to the thickness of the floor


They facilitate the crossing of PE-FLEX ventilation ducts®


They allow PE-FLEX® channels to cross each other with other installations


Frequently asked questions

What are the dimensions of the PE-FLEX® ventilation duct coil, if I would like to pick it up in person?

The cable reel varies in size, depending on the diameter and length of the pipe. Correspondingly, it is (diameter x height of the coil):
- 1.20 x 0.40 meters and weight approx. 17 kg for a coil of 100 meters of PE-FLEX® Ø50 mm pipe,
- 1.20 x 0 , 45 meters and weight about 15 kg for a roll of 50 meters of PE-FLEX® pipe Ø75 mm,
- 1.35 x 0.60 meters and weight about 22 kg for a roll of 50 meters of PE-FLEX® pipe Ø90 mm,

What is the inner and outer diameter of PE-FLEX® pipes?

The internal diameter of the PE-FLEX® Ø50 mm pipe is 40 mm, the PE-FLEX® Ø75 mm pipe is 60 mm, and the PE-FLEX® Ø90 mm pipe is 75 mm. The exact technical specification of the ventilation ducts is available in our price list:

What is the tightness of the installation? Do I need a gasket for the ducts connectors?

Connectors in the PE-FLEX® system, like all plenum and manifold boxes, have built-in gaskets and a CLICK assembly system, that allows for high-class robustness of the entire system (class "C" according to PN-EN 12237). Additional seals are not required.

What is the durability of the bactericidal coating in the pipes?

The smooth internal coating has antibacterial and fungicidal additives in the form of active silver particles in the polymer matrix, which ensures long-term operation regardless of the air temperature and its humidity. The inner layer also has an antistatic effect, which reduces the settling and accumulation of dust in the pipes.

If I'm just a few meters away of PE-FLEX® ventilation pipe, may I buy some?

PE-FLEX® does not sell ventilation ducts by meters, only by whole scrolls.


manifold boxes are a starting point of the whole PE-FLEX® mechanical ventilation system . From the distribution boxes, the whole installation branches off throughout the building through the PE-FLEX® ventilation ducts. The manifold boxes are made of stainless steel and contain plastic Push-to-Connect spigots. Each ventilation system should consist of at least two manifold boxes - supply and extract.

In PE-FLEX® system, the manifold boxes are custom-made - they can be of any dimension and spigots configuration. It is sufficient to design them in our program called BOXMAKER. Once ordered and paid for, they will be ready for shipment within 24 hours. Optimally selected manifold boxes, will help make the ventilation installation properly and connect the MVHR units in a faster, easier and better way.

  • They are made of stainless steel with polipropylene spigots with built-in gaskets and Push-to-Connect coupling for PE-FLEX® ventilation ducts.
  • They can be of any even non-standard dimensions and they can have various configurations of inputs and spigots - you are the one who makes the decision; customise it for a specific project.
  • You can order flat manifold boxes to be hidden in the floor or they can have a couple of rows of spigots.
  • They can be made in the through version - with spigots facing each other.
  • You are the one who indicates where the mounting brackets should be placed.
  • Orders placed and paid for on a business day untill 3 pm, are always ready for shipment on the next business day!


Design, evaluate and order your own distribution box!


Boxmaker is a program dedicated to design and evaluate manifold boxes available at::
boxmaker.peflex.plThe program allows to generate a distribution box of any dimensions and to customize it with various types of stub pipes and connection muffs .

During the design phase, the current price of the generated product is displayed, which changes if there are changes applied to the box.



Custom-made distribution box ready next day? You don't believe? See below


Frequently asked questions

What is the waiting time for distribution boxes for an individual project?

Boxes designed in the BOXMAKER program, ordered and paid for by 3 p.m. (on business days) are ready for shipment on the next business day.

Can distribution boxes be L-shaped or T-shaped?

Yes. Two separate boxes should be designed and in the comment to the order, specify which sides are to be connected. There will be an additional charge for the connection.


Recuperator(air handling unit) is the central element of the mechanical ventilation system with heat recovery. It is a device which forces the air exchange inside the house and is responsible for heat recovery (recuperation) from the extracted air. It removes the polluted air from the house, replacing it with the fresh one. Filtered air from the outside, provides the thermal comfort all year round in all the rooms. The main elements of the MVHR unit are two fans - supply and extraction, and the heat recovery is provided by heat exchanger where two streams of airflow do not blend but recover mutual energy, i.e. heat.

Air handling unit along with PE-FLEX® system of air distribution, is a complete system of mechanical ventilation with heat recovery at home.


Air handling unit installation:

Ducts bringing the air in and out the unit should be as short as possible.

It is necessary to provide access to the unit in order to replace the filters, carry out maintenance and potential repairs.

The air temperature inside the room dedicated to the MVHR unit, should be above 5 Celsius degrees.

The possibility of removing the condensate to the sewage should be taken into account.

The noise from the MVHR unit should be prevented from spreading across the other rooms, by not installing the unit close to the loft ladder, door, etc.

It must be remembered to have a proper cable for the unit controller or to connect the MVHR unit with router (when controlling the unit via internet).


AHU in the attic

  • Easy to run the ducts to and from the air inlet/outlet.
  • Short lengths of ventilation ducts
  • Easy installation
  • Risk of unit freezing in the unheated attic and heat loss if the ducts are insufficently insulated.
  • Possible difficulties with the condensate discharge
  • Difficult to connect the ground heat exchanger

AIR HANDLING UNIT in the living area
(e.g. boiler room)

  • Location of MVHR in a warm room
  • Simplified removal of the condensate
  • Easy service access
  • Large dimensions of the unit which use up storage space
  • Risk of spreading the noise across the other rooms when the installation is insufficiently insulated

AHU in the cellar

  • Easy to organize proper place to install the unit
  • Easy connection to the installation of the ground heat exchanger
  • Difficult to run the ducts to and from the air inlet/outlet.
  • Possible difficulties with distribution of the installation

Where to place air inlet and outlet?

Basic rules of how to install air inlet and outlet

  • Air inlets in the ventilation and air conditioning installations, should be protected against rainfall and wind. They should be placed in such a way, which enables to intake the purest and the coolest air in the summer time.
  • The air inlet should not be placed in an area where there is a risk of supplying the air from the air outlet or impuritites from a chimney.
  • Air inlets placed above ground level or on the wall of two lowest floors should be placed at the distance of at least 8 metres at the horizontal projection from the street and parking spaces for more than 20 cars, solid waste collection sites, sewage vents and other sources of air pollution. The distance of the lowest edge of the inlet opening from the ground level should be at least 2 metres.
  • the air intake on the roof of the building, should be located in such a way that the lower edge of the inlet opening is at least 0.4 m above the surface on which they are installed and that a distance of at least 6 m from the sewage outlets is kept.
  • The exhaust air from buildings or rooms, polluted to a degree exceeding the requirements set out in separate provisions on the permissible types and amounts of substances polluting the outside air, should be cleaned before being released into the atmosphere.
  • Air launchers in ventilation and air conditioning systems, should be protected against rainfall and wind, and should be located in places that allow the exhaust air to be discharged without endangering the health of building users and people in its vicinity and exerting a harmful effect on the building.
  • The lower edge of the launcher with a horizontal air outlet, located on the roof of the building, should be at least 0.4 m above the surface on which the launcher is installed, and 0.4 m above the line connecting the highest points of the parts of the building protruding above the roof. at a distance of up to 10 m from the launcher, measured in the horizontal projection.
  • Location of the air launcher at the ground level is allowed only with the consent and under the conditions specified by the competent state sanitary inspector.
  • It is allowed to locate the air release in the wall of the building, provided that:
    - the exhaust air does not contain unpleasant odors and pollutants harmful to health,
    - the opposite wall of the neighbouring building, with windows at a distance of at least 10 m or without windows at a distance of at least 8 m,
    - windows located on the same wall are horizontally located at least 3 m from the launcher, and at least 2 m below or above the launcher,
    - air intake located in the same wall of the building, is below or on the same level as the launcher, at a distance of at least 1.5 m.
  • The distance from the roof vents, measured in the plan view, should not be less than 3 m from:
    - the edge of the roof, below which the windows are located,
    - the nearest edge of the window in the roof,
    - the nearest edge of the window in wall above the roof.

Read all

ustawienie wyrzutni

In short

  • Install the air inlet and outlet at least 2 metres from each other (increase the distance to six metres or more if possible).
  • Try to locate the air intake on the side of the building, where there will be less chance of inhaling odors and pollutants.
  • Installing the air intake and launcher in the soffit is a very good idea.
  • The air intake and launcher should be mounted at least two meters above ground level.
  • Do not place the launcher in the immediate vicinity of the window.
  • Remember about access to the grates- it is worth cleaning them from time to time and checking their patency.

Connecting the AHU to the installation

  • The air handling unit (recuperator) should be connected to the ventilation system by means of insulated rigid or flexible ducts
  • Ducts which connect the MVHR unit with air inlet and air outlet, if lead through heated rooms, should contain an additional insulation layer which minimizes heat loss in a room .The same applies to the ducts connected to the distribution boxes when the ducts are in the unheated area.
  • The diameter of the connecting duct should not be too small. If particular segments of the duct are too long, their diameter should be additionally increased. In order to minimize flow resistance, the air inlet/outlet grid diameter should be one size bigger than the spigots of the MVHR unit.
  • Air supply and exhaust ducts should contain dampers. The manifold boxes can be connected via SONODEC CLASSIC flexible ducts. These ducts contain micro-perforated inner layers which acts as a damper.

prezentacja rury


In case of not using proper duct's insulation, it is possible that condensate can be formed. Such a phenomenon can appear during heating period when the outside air transported through ventilation ducts has considerably lower temperature than the one inside the building.

Frequently asked questions

What should you remember when planning a recuperator installation site??

You must take into account the dimensions of the device to which a service access must be provided (e.g. for periodic replacement of filters). You should also provide a place for connecting ventilation ducts.

It is very important to bring the condensate drain and power supply near the device, as well as the cable connecting the recuperator with the controller located in the residential part of the house (from the controller side it is worth leaving a junction box to facilitate its installation ).

How often do you need to replace the filters in the recuperator?

It depends on many factors, i.e. the location of the building, time of year, and the type of filters used in the recuperator. Usually, filters should be replaced between 3 and 6 months. It's good to take them out of the device from time to time and clean them with a vacuum cleaner.

Can the PE-FLEX® system work with any recuperator?

Yes, virtually any recuperator suitably selected for the size of the installation can be connected to the PE-FLEX® ventilation system.


Finishing and mounting accessories for PE-FLEX® system of mechanical ventilation are essential ventilation materials, in order to have the installation properly done and connected to the MVHR unit.

Frequently asked questions

What is the outer / inner diameter of the SONODEC CLASSIC duct?

Dimensions of DEC Sonodec Classic insulated flexible ducts:
- model 160 - dia. inside Ø162 mm, dia. outside Ø210 mm *
- model 200 - dia. inside Ø203 mm, d. outside Ø250 mm *
- model 250 - dia. inside Ø254 mm, dia. outside Ø300 mm *
* includes 25 mm of insulation

Do I have to purchase a PE-FLEX® pipe knife separately?

The knife is added FREE OF CHARGE to each order containing distribution boxes.

Why are INNO JEVEN dampers used?

It has through holes, thanks to which it is possible to regulate the air flow, and its material and construction give it very good damping properties.


PE-FLEX® EPS air distribution system is an innovative way to combine high installation aesthetics with fast installation and excellent duct insulation.

The PE-FLEX® EPS air distribution system has been developed for minimising heat loss n the building and possibilities bridgeless routing of ventilation ductsbetween the air handling unit and the air intake and outlet grilles. It also allows for a quick and simple, yet professional connection of the recuperator with the manifold boxes, ensuring high parameters of the entire home recuperation system.


Up to 25% higher insulation level (thermal resistance) than flexible and rigid ducts insulated with wool of the same thickness ensures excellent performance of the installation.

Absence of thermal bridges and tightness of insulation along the entire length of the installation, thanks to built-in sockets and system couplings connecting all the elements of the system.

Simplicity of assembly on the basis of clamping and cutting the elements together without the need for professional equipment and without the need for additional insulation of the elements.


The mechanical ventilation system concept (recuperation) contains technical description, illustrations showing the concept of distribution of the installation , location of MVHR unit, references to the information regarding the applied elements and investment appraisal . Purchased concept is done only for mechanical ventilation based on PE-FLEX ® system for Ø50, Ø75 or Ø90 mm ducts.

The concept contains:

Technical description

drawing of the concept of distribution of the installation and location of the MVHR unit

References to the information regarding the applied elements

Investment appraisal

How to order the ventilation system concept and quote of PE-FLEX ® system?


Select the area of ​​the house and add the project to the quote


Order and pay for the ventilation system concept


Send to
necessary documentation


Wait for our designer to contact you


Collect the project and a quote from your e-mail address after the agreed date

Frequently asked questions

How can I order a project?

You can place an order directly on our online price list by clicking HERE.

What is needed to prepare a ventilation project?

After purchasing the design, please send it to the address consecutively:
Projections of all storeys of the building with changes in the project - Sections A-A and B-B
Projection of the roof truss
Please send the files in DWG, JPG or PDF format. The maximum size of attachments is 25 MB.

What does the prepared ventilation project contain?

The project includes a technical description, drawings presenting the concept of distribution of the installation and the valuation of materials.

What size openings should I prepare in the ceiling?

The size of the hole in the ceiling depends on the spigot's diameter of the plenum and manifold box . In the prepared project, the diameter of the spigots to be used, is selected and described. It is safe to make a hole 1-2 cm larger than the diameter of the pipe.

Why is there no price for the SPIRO rigid pipe in the received design?

We do not sell SPIRO rigid pipes and fittings made of galvanized steel.

I would like to order a project from you. What is the waiting time for the execution of the project?

The project execution time is usually around 7 business days. Up-to-date information on the execution time is available on our price list: After placing the order, the designer informs about the set date of project preparation.

I have received the project. How can I place an order for a material quoted now?

A prepared project with a valuation is not tantamount to the preparation of an order. The order should be placed at the following address:

Do you make ventilation projects based on a system other than PE-FLEX?®

We offer only a mechanical ventilation project based on the use of the PE-FLEX® system.

Can such a project be added to the building permit documents?

The ventilation design made by us, is a demonstrative design - it does not have stamps and signatures. It serves as a concept for the distribution of ducts and the arrangement of ventilation.

Purchasing questions

How can I place an order?

How can I place an order? - it is the fastest form of purchase

Is it possible to collect in person?

Yes, it is possible to collect in person, but only the goods that have been previously ordered and paid for. After completing the order, we send information about the possibility of collecting the goods at the following address: Targowisko 529, 32-015 Kłaj

Is prepayment the only form of payment?

The only form of payment accepted by PE-FLEX®, is a prepayment by bank transfer to the account of the value of the entire order.

Can I pay in cash on delivery?

It is not possible to pay in cash.

Will I be informed about the shipment?

Yes, on the day of shipment, when the goods are complete, you will receive a text message and an e-mail with the number of the consignment note and the date for which the delivery has been scheduled.

I would like to purchase goods with assembly. Where can I find the nearest installer?

Recommended installation companies can be found at: