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Ventilation bends

Photo of product family: Ventilation bends


Bends for ventilation are produced in diameters range 80 mm to 1600 mm of galvanized,
aluminium and stainless steel sheet at 15, 30, 45, 60 and 90 degrees angles.

It is recommended to choose the version with EPDM seals to ensure achieving "D" class
leakage (airtightness) according to EN 12237 (SITAC certificate).

In both versions there are 4 types of bends:

  • BP (w/o seals) and BPL (with seals) pressed bends - in diameters range 80 to 250 mm.
  • BS (w/o seals) and BSL (with seals) segmented bends of R=D radius - manufactured in diameters range 200 to 1600 mm.
  • BSK (w/o seals) and BSKL (with seals) short segmented bends of R=0,6D radius
  • BSD (w/o seals) and BSDL (with seals) long bends of R=2D radius - which are manufactured in diameters range 160 to 1250 mm.

Optionally segmented bends can be produced with various non-standard diameters, a thickness of sheet, radii and angles.

Ventilation bends - Products range
Miniature picture Product code Name of product Files to download
Photo of product Pressed bends with seals BPL

Pressed bends with seals


Pressed ventilation bends are used for spiral ducting and flexible ducts.
Seam welding provides air-tightness class D, without additional sealants.

EPDM double lip rubber seal provides air-tightness class D for ventilation
and heat recovery installations. In order to connect the fitting with ventilation
duct, we recommend inserting the bend into the duct.
The design of the pressed bends gives lower resistance and pressure drops.

Pressed bends with seals
Photo of product Pressed ventilation bends BP

Pressed ventilation bends


Pressed bends are designed for building ventilation systems based
on spiral and plain ducts. Seam welds improve the air tightness of
the ventilation system, while the hemmed rim helps to avoid cutting
injuries during handling and installation.

The piece is connected with a duct by inserting one into the other.
The pressed form of the ventilation piece helps to reduce the flow resistance
and the pressure loss. Air tightness can be increased to class B by wrapping
the joints with the TAL, MET or DUCT sealing tape.

Pressed ventilation bends
Photo of product Pressed bends with seals  - 1,5D BPDL

Pressed bends with seals - 1,5D


Pressed bends are designed for building ventilation systems based on spiral
and plain ducts. Seam welds provide air tightness class D without the need
to use any other sealants. In ventilation and heat recuperation systems,
the double EPDM gasket provides air tightness class D according to EN 12237.

The piece is connected with a duct by inserting one into the other. The pressed
form of the ventilation piece helps to reduce the flow resistance and the pressure loss.

Pressed bends with seals - 1,5D
Photo of product Pressed bends  - 1,5D BPD

Pressed bends - 1,5D


Pressed bends are designed for building ventilation systems based on spiral
and plain ducts. Seam welds provide airtightness class D without the need
to use any other sealants. In ventilation and heat recuperation systems,
the double EPDM gasket provides air tightness class D according to EN 12237.

The piece is connected with a duct by inserting one into the other. The pressed
form of the ventilation piece helps to reduce the flow resistance and the pressure loss.

Pressed bends - 1,5D
Photo of product Short pressed bends with seals BPKL/BPKFL

Short pressed bends with seals


Short pressed bends are designed for building ventilation systems
based on SPIRAL ducts and plain ducts. Seam welds provide air tightness
class D without the need to use any other sealants.

In ventilation and heat recuperation systems, the double EPDM gasket provides
air tightness class D according to EN 12237. The piece is connected with
a duct by inserting one into the other. The short bending radius helps
installing the ductwork under a suspended ceiling with a limited clearance.

BPKFL bends feature a female joint for direct connection to the mounting
frames of various air valves (e.g. KN-RM or KWO-RML).

Short pressed bends with seals
Photo of product Short pressed bends BPK/BPKF

Short pressed bends


Short pressed bends are designed for building ventilation systems
based on spiral and plain ducts. Seam welds improve the air tightness
of the ventilation system, while the hemmed rim helps to avoid cutting
injuries during handling and installation.

The piece is connected with a duct by inserting one into the other. The short
bending radius helps installing the ductwork under a suspended ceiling with a
limited clearance. BPKFL bends feature a female joint for direct connection to
the mounting frames of various air valves (e.g. KN-RM or KWO-RML).

Short pressed bends
Photo of product Segmented bends with seals BSL

Segmented bends with seals


Segmented bends are designed for building ventilation systems based on
SPIRAL ducts and plain ducts. They are made of 4 segments; bends in
diameters of DN 1120 mm and greater are composed of 5 segments.

The segments are fastened by hemming and seaming. The inside surface of
the hemmed seams is sealed, and as a result of the double
EPDM gaskets, this solution provides air tightness class D according to
EN 12237 for ventilation and recuperation systems.

The piece is connected with a duct by inserting one into the other.
The pieces can be made of 1.4404 stainless steel sheet for ventilation
systems in swimming pools.

Segmented bends with seals
Photo of product Segmented bends BS

Segmented bends


Segmented bends are designed for building ventilation systems based
on spiral and plain ducts. They are made of 4 segments; bends in
diameters of DN 1120 mm and greater are composed of 5 segments.

The segments are fastened by hemming and seaming. Bend sizes of 1.5D
or 2D are available by adding segments to reduce the pressure loss and
the flow resistance along the ventilation system. The piece is connected
with a duct by inserting one into the other.

Segmented bends
Photo of product Short segment bends BSK

Short segment bends


Segmented bends are designed for SPIRAL ducts and plain ducts.
They are made of 4 segments; the bends in diameters of DN 1120 mm
and greater are made of 5 segments.

The segments are fastened by hemming and seaming. Bend sizes of 1.5D or
2D are available by adding segments to reduce the pressure loss and
the flow resistance along the ventilation system. The piece is connected
with a duct by inserting one into the other.

Short segment bends
Photo of product Short segmented bend with gaskets BSKL

Short segmented bend with gaskets


Short pressed bends are designed for building ventilation systems based on
spiral ducts and plain ducts. Seam welds provide airtightness class D without
the need to use any other sealants. In ventilation and heat recuperation systems,
the double EPDM gasket provides air tightness class D according to EN 12237.

The piece is connected with a duct by inserting one into the other. The short
bending radius helps installing the ductwork under a suspended ceiling with a
limited clearance. BPKFL bends feature a female end for direct connection to
the mounting frames of various air valves (e.g. KW-S-RM or KNT-RML).

Short segmented bend with gaskets
Photo of product Long segment bends BSDL/BSD

Long segment bends


Segmented bends are designed for spiral ducts. They are made of 5 segments;
the bends in diameters of DN 1120 mm and greater are made of 6 segments.
The segments are fastened by hemming and seaming. BSDL bends feature sealed
inside surfaces of the hemmed seams and double EPDM gaskets to provide air
tightness class D according to EN 12237 for ventilation and heat recuperation systems.

The bending radius is ca. 1.5D to reduce the pressure loss and the flow resistance along
the ventilation system. The bending radius can be increased to 3D or 4D on request
to further improve the flow resistance.

Long segment bends
Photo of product Offsets for spiral ducts and fittings  ODSOL/ODSO

Offsets for spiral ducts and fittings


ODSOL/ODSO Round duct offsets help routing ductwork around
obstacles. The offset height is standardized; however, the
oblique tube length can be customized. The offset can also
be fabricated with two 45 or 30-degree bends and a spiral
duct section.

Offsets for spiral ducts and fittings
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