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Round dampers

Photo of product family: Round dampers

Dampers are made in diameter range from 80 mm to 630 mm of galvanized, aluminium and acid-resistant sheet.

  • Regulating damper DAR/DARL passes about 30% of air with a possibility of full opening of a duct.
  • Shut off damper DAS/DASL stops about 95% of air during full closing stage.
  • Airtight damper DAT/DATL enables full closing of a duct and in connection with a servomotor with a return spring it acts as a closing flap.
  • Sliding dampers GK/GKL enables cleaning of ventilation installations.
  • Iris type dampers GBL enable a stepless adjustment of air jet - they are equipped with a connector for a measuring device.
  • By-pass dampers DATVTL or DATATL are used for intaking air into a system from two sources such as a wall mounted air intake grille and an air exchanger.

Dampers are used to ventilation systems.

Round dampers - Products range
Miniature picture Product code Name of product Files to download
Photo of product Plastic foam damper/silencer DAT-AKU

Plastic foam damper/silencer

 

The DAT-AKU is an economical and an easy-to-install foam
damper/silencer designed for central ventilation systems
with attenuating properties. The design and the material the
foam damper is made of - namely - non-flammable flexible
polyurethane foam (class B2 according to DIN 4102-1) lead to
its double function - a damper with an attenuating properties.
Installation instructions: Insert the damper into the circular
duct (e.g. before the air valve), then adjust pressure and airflow
by removing the number of open holes. In order to obtain better
attenuation, install several DAT-AKU foam dampers in series.

Plastic foam damper/silencer
Photo of product Regulating dampers with EPDM gasket DARL

Regulating dampers with EPDM gasket


The DARL regulating damper with EPDM gaskets at both flange
connections has been designed for cladding with up to 50 mm
thick insulation.

The damper closure is pivoted on separate square rods.
The square rod pivots are replaced with a single solid bar in
regulating dampers of diameter 450 mm.
The damper closure position can be read on the 0° to 90° dial of
the control handle. Closing the damper closure allows 20% of
the rated airflow to pass. The damper closure opening ratio can
be fixed with a screw.

Regulating dampers with EPDM gasket
Photo of product Regulating dampers for round spiral ducts DAR

Regulating dampers for round spiral ducts

The DAR dampers for round ducts are available in
the diameters of 80 mm to 630 mm.
The damper closure has two chord-cut edges to provide
20% of the rated air flow in the closed position.

The dampers 450 mm in diameter and larger have the damper
closure pivot braced additionally with a single steel bar
across the opening. The damper mechanism can be provided
with up 50 mm thick insulation and features a control dial
to show the opening ratio. The dampers of diameter 450 mm
or greater also feature the KIT-DS-H damper mechanism control
lever for easier operation.

Regulating dampers for round spiral ducts
Photo of product Regulating round dampers DARH

Regulating round dampers


The DARH dampers regulate the air flow rate in ventilation systems.
The damper closure has two chord-cut edges to provide 20% of
the rated air flow in the closed position.

This damper model is the easiest to install and operate, and
the most budget-friendly solution for air flow control in round
ductwork systems.

Regulating round dampers
Photo of product Shut-off dampers with EPDM gasket DASL

Shut-off dampers with EPDM gasket


The DASL shutoff damper with EPDM gaskets at both flange
connections is designed for cladding with up to 50 mm thick insulation.

The DASL shutoff damper is a good choice when the ductwork closure
does not have to be fully airtight. The damper closure position can
be read on the 0° to 90° dial of the control handle. The damper closure
opening ratio can be fixed with a screw.

Shut-off dampers with EPDM gasket
Photo of product Shut-off round dampers DAS

Shut-off round dampers


The DAS dampers are designed for cladding with up to
50 mm thick insulation.

The DAS damper is a good choice when the ductwork closure
does not have to be fully airtight. The damper closure
position can be read on the 0° to 90° dial of the control handle.
The damper closure opening ratio can be fixed with a screw.
The product has safe edges.

Shut-off round dampers
Photo of product Shut-off dampers DAS-PVC

Shut-off dampers


The DAS-PVC dampers are designed for cladding with up to
30 mm thick insulation.

The DAS-PVC shutoff damper is a good choice when the ductwork
closure does not have to be fully airtight. The damper closure
position can be read on the 0° to 90° dial of the control handle.
The damper closure opening ratio can be fixed with a screw.
The product has safe edges.

Shut-off dampers
Photo of product Hand-operated damper DASH

Hand-operated damper


DASH dampers are among the most budget-efficient solutions
for air flow control in round ductwork systems. The safe edges
at the damper ends protect against accidental injury during
the installation process.

The wing nut can be tightened to set the control lever in place
at a specific opening angle. The dial of the control handle shows
the damper closure / opening ratio. This damper is designed for air
ducts in diameters of 80 to 315 mm and made from galvanized steel sheet.

Hand-operated damper
Photo of product Airtight shut-off dampers - DIN/EN 1751 Class 4 DATL/DAT

Airtight shut-off dampers - DIN/EN 1751 Class 4


The DATL/DAT dampers are designed for cladding with up to
50 mm thick insulation.

The DATL/DAT dampers are a good choice when the ductwork
closure must be airtight. The damper closure position can
be read on the 0° to 90° dial of the control handle.
The damper closure opening ratio can be fixed with a screw.

 

Airtight shut-off dampers - DIN/EN 1751 Class 4
Photo of product Round Backdraught Damper - Inserts into duct DAOSL-IN

Round Backdraught Damper - Inserts into duct


The DAOSL-IN dampers feature a split flap closure and are
designed as non-return dampers which allows a single air flow direction only.
Both closure flaps are made of light-weight aluminium sheet and hinged on a
steel bar with springs which keep the flaps closed when there is no air flow.

This damper is often installed upstream of an air intake or an air exhaust unit
to prevent the air backflow. The DAOSL-IN dampers are designed for inline duct installation.
This saves time and space and requires fewer installation accessories.

Round Backdraught Damper - Inserts into duct
Photo of product Reinforced backdraft damper DAOSL-B / DAOS-B

Reinforced backdraft damper


The DAOSL-B / DAOS-B ventilation dampers is a new version
of DAOS (L) backdraft dampers. In addition, it is reinforced
with a reinforcing rods, making it possible to manufacture
large diameters up to Ø630mm, while maintaining the
rigidity of the construction and correct operation of the
blades. The DAOSL-B damper with seals is used in installations
that meet airtightness class D according to DIN EN 12237.
The DAOS-B-FLS version with flanges is suitable for mounting
on axial fans.

Reinforced backdraft damper
Photo of product Non-return (Backdraft) dampers with double EPDM gasket DAOSL

Non-return (Backdraft) dampers with double EPDM gasket


The DAOSL dampers are designed for ventilation ductwork systems
which require air tightness class D according to EN 12237 requirements.

These dampers feature a split flap closure and are designed as non-return
dampers which allows a single air flow direction only. The damper closure
has approximately air tightness class 2 as per EN 1751:2002, without full
class compliance.

Both closure flaps are made of light-weight aluminium sheet and hinged on a
steel bar with springs which keep the flaps closed when there is no air flow.
This damper is often installed upstream of an air intake or an air exhaust
unit to prevent the air backflow.

Non-return (Backdraft) dampers with double EPDM gasket
Photo of product  Round non-return (Backdraft) dampers DAOS

Round non-return (Backdraft) dampers


The DAOS dampers feature a split flap closure and allow the airflow
to pass in one direction only. The aluminium closure flaps are pressed against
a foam seal when closed to reduce the operating noise in the ductwork.

The split flap closure is held closed with a spring gear, which makes it also
possible to use the damper in vertical installations. A version intended for
a full-male insertion into the ductwork ends is available on special request.

Round non-return (Backdraft) dampers
Photo of product Sliding dampers with/without sealing GKL/GK

Sliding dampers with/without sealing


The hand-operated duct gate damper is designed for air ventilation
and dust extraction systems which carry particulates of sawdust,
EPS debris, or other light air fractions of solids.

An advantage is a sliding gate which opens the passage to full
clearance, without any obstruction by closure edges or pivot rods.
The gate damper is a rigid structure made of 1-mm thick galvanized
steel sheet, to which ILS flanges (GK gate damper) or ILSL flanges
with gaskets (GKL gate damper) are attached. Gate dampers can be
requested with FLS steel flanges or upturns for use with quick clamps.

GK — plain end flange gate damper
GSL — gate damper with EPDM gaskets at the flanges, air tightness
class D according to EN 12237

Sliding dampers with/without sealing
Photo of product Alternating shut-off dampers DATVTL

Alternating shut-off dampers


The DATVTL T-piece damper is an air distribution units which
can replace two separate ventilation dampers. The easy adjustment
control can divert the air flow to either of the two 90°-spaced legs,
with the other leg automatically closed.

The damper can also be used for supplying air via either of the two legs
from an external air supply valve, a ground-coupled heat exchanger, or a
fireplace hot air hood. All damper sizes come with the KIT-DS-H damper
mechanism control handle for easier operation. The ends of the damper
are provided with EPDM gaskets to ensure air tightness class D.

Alternating shut-off dampers
Photo of product Airtight dampers for servomotor DATML/DATM

Airtight dampers for servomotor


Dampers with actuator mounting are available in diameters of Ø80 to Ø630 mm,
including intermediate sizes. The actuator mounting is designed to enable
cladding with up to 50 mm thick insulation.

The DATML/DATM dampers are a good choice when the ductwork closure must be airtight.
The opening angle can be fixed with a mechanical limiter installed directly on the
actuator. The damper closure can be deflected by up to 2 cm when the air pressure
exceeds 2,000 Pa. For outdoor installations, the actuator must be protected from
UV light and weather.

Airtight dampers for servomotor
Photo of product Alternating dampers for servomotor DATVTML

Alternating dampers for servomotor


The bypass dampers can replace a set of two standard dampers
with a T-piece and couplings, which makes the entire assembly
20 to 30% shorter.

The DATVTML damper has a motor operator.

Alternating dampers for servomotor
Photo of product Iris dampers with flow meter GBL

Iris dampers with flow meter


The GBL iris dampers are essential for smooth control of
the duct air pressure. The lever and the iris blade mechanism
allows changing the clear opening diameter in infinitely variable steps.

The iris-type closure allows choking the air flow without turbulence
or in-duct noise. The GBL iris damper can be installed both in air
supply and air exhaust ducts.
This product features two output ports as an interface for an air flow meter.
The GBL can be opened to the full clear diameter for easier cleaning of the ductwork.
The iris dampers, however, cannot be sealed shut (the maximum closing ratio is ca.
25% of the nominal clear diameter).

Iris dampers with flow meter
Photo of product Iris dampers with flow meter for servomotor GBLM

Iris dampers with flow meter for servomotor


The GBLM iris dampers can be provided with actuators.
The GBLM iris dampers are used for smooth control of
the duct air pressure. The lever and the iris blade
mechanism allow changing the clear opening diameter
in infinitely variable steps.

The iris-type closure allows choking the air flow without
turbulence or in-duct noise.
The GBLM iris damper can be installed both in air supply
and air exhaust ducts. It also features two output ports
as an interface for an air flow meter. The full-clear opening
of the iris damper helps with cleaning internal surfaces of the ductwork

Iris dampers with flow meter for servomotor
Photo of product Multi-blade dampers DASQ/ DASQL/ DASQM/ DASQML

Multi-blade dampers


The round multi-blade damper can be used to control
and isolate air flow in round ductwork.
The round multi-blade damper design is based on the DSQW model.
This model, however, features a housing with a branch at each end,
sized to match the SPR ducts.

The DASQ / DASQL dampers are hand-operated. The DASQM / DASQML dampers
are designed for use with actuators.
All dampers have the blade angle (and the opening ratio) controlled
with a system of gears driven by a hand lever or an actuator.
The damper mechanism is installed on the outer surface of the housing.

Multi-blade dampers
Photo of product Regulating dampers with mounting plate for actuator DASML/DASM

Regulating dampers with mounting plate for actuator


Dampers with servomotor shelf, available in sizes from Ø80 to Ø630mm,
including sizes in between. The servomotor shelf is installed so as to
admit an insulation thickness of up to 50mm. DASML/DASM dampers can be
employed wherever completely airtight shut-off is not required.

The setting angle can be adjusted using a mechanical end stop screw fitted
directly onto the servomotor.If the damper is to be operated outdoors,
the motor should be protected against UV radiation and precipitation.
It is possible to use various servomotors with each of the dampers.

DASM – shut-off damper for servomotor.
DASML – shut-off damper for servomotor, with gaskets on flanges.

Regulating dampers with mounting plate for actuator
Photo of product Alternating dampers DATASL DATASL

Alternating dampers DATASL


The DATASL T-piece double regulating dampers for round ductwork
systems can replace two standard DASL dampers. The alternate-opening
link which couples both closures of the damper helps close one
closure and at the same time open the other closure using a single
damper mechanism.

This design can save approximately 20 to 30% of installation space
and helps avoid coupling two separate dampers with T-pieces and MSF
couplings. The double EDPM gasket at each flange provides the best
air tightness class D as per EN 12237:2005.

Alternating dampers DATASL
Photo of product Round dampers with a perforated centre DAP-CV

Round dampers with a perforated centre


The DAP-CV dampers are designed for cladding with up to
50 mm thick insulation.
The DAP-CV shutoff damper is a good choice when the ductwork
the closure does not have to be fully airtight.

The perforated closure provides an even air flow without turbulence.
The damper closure position can be read on the 0° to 90° dial of the control
handle. The damper closure opening ratio can be fixed with a screw.
The DAP-CV shutoff damper can be easily adapted for mounting Belimo power actuators.
The power actuator must be compatible with the 8x8 mm square bar.
The product has safe edges.

Round dampers with a perforated centre
Photo of product Round dampers with EPDM rubber gasket DAPL-CV

Round dampers with EPDM rubber gasket


The DAPL-CV damper with EPDM gaskets at both flange connections
is designed for cladding with up to 50 mm thick insulation.
The DAPL-CV shutoff damper is a good choice when the ductwork
closure does not have to be fully airtight.

The perforated closure provides an even air flow without turbulence.
The damper closure position can be read on the 0° to 90° dial of
the control handle. The damper closure opening ratio can be fixed
with a screw. The DAPL-CV shutoff damper can be easily adapted for
mounting Belimo power actuators. The power actuator must be compatible
with the 8x8 mm square bar.
The product has safe edges.

Round dampers with EPDM rubber gasket
Photo of product Dampers with lower demands for shut-off capacity DAS-CV

Dampers with lower demands for shut-off capacity


The DAS-CV dampers are designed for cladding with
up to 50 mm thick insulation.

The DAS-CV shutoff damper is a good choice when the ductwork closure
does not have to be fully airtight. The damper closure position
can be read on the 0° to 90° dial of the control handle.
The damper closure opening ratio can be fixed with a screw.
The DAS-CV shutoff damper can be easily adapted for mounting
Belimo power actuators. The power actuator must be compatible with
the 8x8 mm square bar.
The product has safe edges.

Dampers with lower demands for shut-off capacity
Photo of product Dampers with lower demands for shut-off capacity - EPDM rubber DASL-CV

Dampers with lower demands for shut-off capacity - EPDM rubber


The DASL-CV shutoff damper with EPDM gaskets at both flange connections
is designed for cladding with up to 50 mm thick insulation.

The DASL-CV shutoff damper is a good choice when the ductwork closure
does not have to be fully airtight. The damper closure position can be
read on the 0° to 90° dial of the control handle. The damper closure
opening ratio can be fixed with a screw.

The DASL-CV shutoff damper can be easily adapted for mounting Belimo
power actuators. The power actuator must be compatible with the 8x8 mm
square bar. The product has safe edges.

Dampers with lower demands for shut-off capacity - EPDM rubber
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