Air duct construction, fittings & industrial engineering

Coolenvi™ supplies precision-manufactured air duct components, fittings and special construction solutions for modern ventilation and ducting systems. The range includes standardised and custom solutions for building services, industrial applications, process air systems, data centres, clean rooms and energy-efficient HVAC systems. In addition, components for industrial applications, containment trays for media and groundwater protection, and metal construction solutions ensure safe, airtight and standards-compliant media handling.

Comparison of Airtightness Classes for Air Duct Systems

DIN EN 16798-3	DIN EN 13779	Leakage Formula (l/s·m²)	Example +500 Pa	Example −500 Pa	Example +1,000 Pa	Example −1,000 Pa
ATC 5	A (Standard)	0.027 × p^0.65	1.53	1.53	2.41	2.41
ATC 4	B (Recommended)	0.009 × p^0.65	0.51	0.51	0.80	0.80
ATC 3	C (Special applications)	0.003 × p^0.65	0.17	0.17	0.27	0.27
ATC 2	D (Grease-tight, watertight)	0.001 × p^0.65	0.06	0.06	0.09	0.09
ATC 1	–	0.00033 × p^0.65	0.02	0.02	0.03	0.03

Note: Leakage rates apply equally to positive and negative pressure testing. The absolute value of test pressure p [Pa] is decisive. Actual test pressures are project-specific.

Installation Sets

Complete installation kits for fast and reliable AC mounting.

Condensate Drainage

Efficient solutions for safe and clean condensate removal.

Air Ducts and Special Components

Hygienic ventilation ducts in rectangular and round systems with fittings, accessories and components.

Sheet Metal Cutout in Galvanised Steel up to 0.88 mm

Galvanised air ducts or fittings occasionally require sheet metal cutouts for installing air grilles, access panels, branch spigots, sensors, inspection windows or for modifications. Billing is based on a unit price as workshop work. For cutouts exceeding 1 m², the order quantity must be considered accordingly. Custom-made products are excluded from return and withdrawal rights. Paid recycling return is available.

€15.50*

Straight Air Ducting - rectangular galvanized

Galvanised air duct section with edge dimensions from 300 to 2000 mm. Both cross-sections are equipped as standard with SBM flange frames for connection to common duct systems. Billing is carried out as a form component based on a standard length of 900 mm with a minimum billing area of 1 m². For standard lengths from 900 mm, billing is made in full m² units to account for sheet metal waste and manufacturing effort. Air ducts and fittings are made of galvanised steel sheet (e.g. according to EN 1505/1507). Components are typically produced with folded seams, while fittings use Pittsburgh or snap-lock seams. SBM flange connections are sealed as standard with sealing compound. Special materials or designs are charged separately based on effort. Suitable for ventilation systems transporting non-aggressive air. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-made products are excluded from withdrawal and return rights. Paid recycling return is available.

€29.17*

Duct Spigot Round or Rectangular - Cutout and Installation

All air grille spigots as well as inlet and outlet spigots are professionally installed into galvanised air ducts. The corresponding fittings and duct components must be ordered separately, as this service covers workshop labour only. Billing is based on a unit price for workshop work. For cutouts exceeding 1 m², the order quantity must be taken into account accordingly. Custom-made products are excluded from return and withdrawal rights. Paid recycling return is available.

€34.00*

Form Air Duct Fitting - rectangular galvanized

Galvanised ventilation duct fitting with edge dimensions from 300 to 2000 mm. Both cross-sections are equipped as standard with SBM flange frames for connection to common duct systems. Billing is based on a duct fitting with a minimum billing area of 1 m² if the sheet metal requirement for smaller components falls below this value. For fittings larger than 1 m², billing is carried out in full m² units to account for sheet metal waste and manufacturing effort. Duct fittings are manufactured from galvanised steel sheet (e.g. according to EN 1505/1507). Components are typically produced with Pittsburgh or snap-lock seams. SBM flange connections are sealed as standard with sealing compound. Special materials or designs are charged separately based on effort. Suitable for ventilation systems transporting non-aggressive air. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-made products are excluded from withdrawal and return rights. Paid recycling return is available.

€37.92*

Sheet metal cut without bending - in galvanised duct steel up to 0.88 mm

Galvanised air ducts or fittings occasionally require sheet metal cut-outs for repairs, cladding or modifications. Billing is based on the fitting price with a minimum charge of 1 m². For cut-outs above 1 m², billing is done in full square metre units to account for material waste and manufacturing effort. Custom-made products are excluded from return and withdrawal rights. Paid recycling return is available.

€37.92*

Flexible Air Duct Connector - Basic with SBM Flange

Galvanised air duct fitting as a flexible fabric connector with edge dimensions from 300 to 2000 mm. Both cross-sections are equipped as standard with SBM flange frames for connection to common duct systems, air handling units, fire dampers or acoustic/vibration decoupling. Billing for this fitting is based on a base price regardless of size. Taking material waste and manufacturing effort into account, billing is carried out in full linear metres as a separate item. The duct fitting is manufactured from galvanised steel sheet (e.g. according to EN 1505/1507). Components are typically spot-welded. SBM flange connections are sealed as standard with sealing compound. Special materials or designs are charged separately based on effort. Suitable for ventilation systems transporting non-aggressive air. Optional equipotential bonding cables are available. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-made products are excluded from return rights. Paid recycling return is available.

€37.98*

Flexible Air Duct Connector - Running Meter

For each galvanised air duct fitting as a flexible fabric connector, this PVC material with galvanised sheet edges provides optimal compatibility for standard SBM flange frames for connection to common duct components. Billing for this fitting is carried out exclusively in full linear metres as an additional item to the base price of the fabric connector. If this item is ordered without the base fabric connector product, only the ordered linear metres are supplied without frame components, etc. Suitable for ventilation systems transporting non-aggressive air. Optional equipotential bonding cables are available. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-made products are excluded from return rights. Paid recycling return is available.

€44.08*

Duct Volume Damper - Manual Version with Lever

For manual or basic air volume control, a professionally manufactured damper blade with external operating lever is installed into air ducts or smooth pipes, such as spiral wound ducting. Damper blades must be ordered as separate components, as this service covers workshop labour only. Billing is based on a unit price as workshop work. For dimensions exceeding 1 m², the order quantity must be considered accordingly. Custom-made products are excluded from return and withdrawal rights. Paid recycling return is available.

€65.50*

Form Air Duct Fitting - transition round/rectangular EL300 mm SYM galvanized

Galvanized ventilation transition piece from round to rectangular in symmetrical design with an edge length of 300 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€74.56*

Form Air Duct Fitting - transition round/rectangular EL300 mm ASYM galvanized

Galvanized ventilation transition piece from round to rectangular in asymmetrical design with an edge length of 300 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€124.32*

Form Air Duct Fitting - transition round/rectangular EL500 mm SYM galvanized

Galvanized round-to-square ventilation transition piece in a symmetrical design with an edge length of 301-500 mm. The square end is equipped with an SBM flange frame as standard and is designed for connection to common duct systems. Billing is based on a minimum area of 1 m² per fitting, regardless of the actual component size. Suitable for ventilation and ducting applications, especially for transitions between round and rectangular duct systems in a galvanized finish. Standard version: ATC 5 according to DIN EN 16798 (Tightness class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard version, such as other tightness classes, pressure classes, or special options, are subject to additional charges and must be ordered separately. Custom-made products are excluded from the right of withdrawal and return. Return for recycling is possible for a fee.

€125.40*

Form Air Duct Fitting - transition round/rectangular EL1000 mm SYM galvanized

Galvanized ventilation transition piece from round to rectangular in symmetrical design with a edge length of 501-1000 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€127.36*

Form Air Duct Fitting - transition round/rectangular EL500 mm ASYM galvanized

Galvanized round-to-square ventilation transition piece in a asymmetrical design with an edge length of 301-500 mm. The square end is equipped with an SBM flange frame as standard and is designed for connection to common duct systems. Billing is based on a minimum area of 1 m² per fitting, regardless of the actual component size. Suitable for ventilation and ducting applications, especially for transitions between round and rectangular duct systems in a galvanized finish. Standard version: ATC 5 according to DIN EN 16798 (Tightness class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard version, such as other tightness classes, pressure classes, or special options, are subject to additional charges and must be ordered separately. Custom-made products are excluded from the right of withdrawal and return. Return for recycling is possible for a fee.

€127.40*

Form Air Duct Fitting - transition round/rectangular EL1000 mm ASYM galvanized

Galvanized ventilation transition piece from round to rectangular in asymmetrical design with a edge length of 501-1000 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€152.11*

Form Air Duct Fitting - transition round/rectangular EL2000 mm SYM galvanized

Galvanized ventilation transition piece from round to rectangular in symmetrical design with a edge length of 1001-2000 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€231.55*

Form Air Duct Fitting - transition round/rectangular EL2000 mm ASYM galvanized

Galvanized ventilation transition piece from round to rectangular in asymmetrical design with a edge length of 1001-2000 mm. The rectangular side is equipped with a standard SBM flange frame for connection to common duct systems. Billing is based on a minimum area of 1 m² per form piece, regardless of the actual component size. Suitable for HVAC and ducting applications, especially for transitions between round pipe and rectangular duct systems in galvanized execution. Standard design: ATC 5 according to DIN EN 16798 (leakage class A according to DIN EN 13779)Pressure range from +1,000 Pa to -500 Pa Deviations from the standard design such as other leakage classes, pressure classes or special options are subject to additional charges and must be ordered separately. Custom-manufactured products are excluded from withdrawal and return rights. Paid return for recycling is available.

€241.32*

Insulation for Air Duct Construction

High-quality insulation materials are essential to prevent condensation, energy loss, and performance issues. Here you can find a selection of diffusion-proof pipe insulation and matching accessories.

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KAIFLEX Continuous Roll KK+ PL19-R S3 - 19 x 1000 x 6000 mm - 6 sqm

Item - Quantity: 1 Pc

Kaiflex KKplus is a highly flexible foam made from synthetic rubber, FEF (Flexible Elastomeric Foam). It reliably prevents condensation and sustainably reduces energy losses. The closed-cell structure provides permanent vapor barrier properties, effectively stopping vapor diffusion and ensuring consistent insulation performance throughout the system's lifetime. Suitable for pipes, fittings, elbows, and similar components in refrigeration, air conditioning, and process engineering systems to save energy and prevent condensation.

€95.04*

Aluminium Adhesive Tape for Pipe Insulation 75mm 45m Roll

Item - Quantity: 1 Pc

Aluminium adhesive tape, specially designed for sealing joints and connections on insulated copper pipes. The standard fixing tape is easy to apply and provides long-lasting sealing and protection against moisture, dust, and corrosion. Ideal for installations in heating, air-conditioning, and refrigeration systems. Material: Aluminium Dimensions: 75 mm x 0.003 mm, 45 m per roll Weight: 0.7 kg per roll Unit: Pc. Perfect for long-lasting sealing of pipe joints and insulation

€15.12* €15.50* (2.45% saved)

K-FLEX ST - ELASTOMER ADHESIVE TAPE B1 3 MM X 50 MM X 15 M

Item - Quantity: 1 Pc

Black, closed-cell elastomer adhesive tape (K-FLEX ST elastomer for cold insulation). Self-adhesive backing with a mesh structure and release liner. For seam covering/bonding in all applications with elastomer insulation materials (e.g., on pipes, ducts, containers, valves, molded parts) for energy savings and/or to prevent condensation.

€19.98*

K-FLEX FRIGO ST 13 X 28 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Kaiflex ST is a flexible, closed-cell, elastomeric insulation material that reliably prevents the formation of condensation and reduces energy losses. The closed-cell structure acts as a permanent vapor barrier, effectively stopping vapor penetration and thus ensuring reliable insulation performance throughout the system's service life. Kaiflex ST is self-extinguishing, does not conduct fire, and does not drip. Thanks to its sound-reducing properties, dust- and fiber-free structure, and antimicrobial finish, Kaiflex ST is particularly suitable for use in public, commercial, and industrial buildings. Closed-cell with vapor barrier Corrosion-resistant Excellent thermal values minimize energy losses Flexible and fiber-free (for high hygiene requirements) Antimicrobial finish

Content: 10 lm (€9.74* / 1 lm)

€97.39*

K-FLEX FRIGO ST 13 X 22 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Content: 14 lm (€6.96* / 1 lm)

€97.39*

K-FLEX FRIGO ST 13 X 15 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Content: 17 lm (€5.73* / 1 lm)

€97.39*

K-FLEX FRIGO ST 13 X 18 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Content: 15 lm (€6.49* / 1 lm)

€97.39*

K-FLEX FRIGO ST 13 X 10 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Content: 23 lm (€4.51* / 1 lm)

€103.72*

K-FLEX FRIGO ST 13 X 12 MM ENDLESS HOSE

Item - Quantity: 1 Pc

Content: 18 lm (€5.76* / 1 lm)

€103.72*