• Model:DAOSL

DAOSL Back Draft Damper

£ 11.49 (excl. VAT)

£ 13.79 (inc. VAT)



The DAOSL back draft damper has aluminium lamellae which open during the air flow in one direction and close when the fan motor is inactive. When no air is flowing, the lamellae are maintained in a vertical position using a spring. The damper is supplied with double EPDM gasket.

Available sizes - 100m, 125mm, 150mm, 200mm, 250mm, 315mm,

Please select below..

Look good, works well, except the shaft of the lanellae cuts into the tube or pipe. Had to shorten mine to get it in. The shaft should not be longer that the seals diameter.

Rated by Trevor

Thank you for the review. The shaft length is not normally a problem because they are normally used to join two lengths of ducting and are not designed to be fully inserted, although it is interesting you have managed it! Be aware any extra friction on the shaft will affect its operation.
- Admin

Available Options

1 x TG-K Duct temperature sensor1 x TG-K3/NTC10-01 - Duct temperature sensor3 x Transformer Speed Control - RTRE- 12.0Amp1 x Helios HQW-200/2 - IP551 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x EM30-24 Control Panel Commissioning Service2 x Helios HQW-200/4 - IP552 x Remote Timer Control - 13511 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6304 x Airvent ceiling fan controller2 x Electronic extractor fan speed controller - FSC 1.51 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Transformer (silent) speed controller - RE 1.5 Amp1 x Easy-fix termination kit - High Rise Ventilator - EFT1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x Helios HQW-630/4 - IP553 x Transformer (silent) speed controller - RE 3.0 Amp3 x Speed Controller - REB51 x Quietflow SQS400-1ECL - Centrifugal Box Fan1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x TG-R room temperature sensor1 x Multiflow SMB550/4-1AC3 x Elta Variable Speed Drive IP66 - 0.75KW2 x Helios PU10 Speed Potentiometer (Flush Mounted)2 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x Transformer Speed Control - RTRE- 7.0Amp2 x Isolator Switch - EFF-ISO1 x CBS-60 Outlet Flange for CSB/CBT-602 x SG-200 Fan Guard for the HQW 2001 x Speed Controller - REB102 x Helios HQW-315/4 - IP551 x TD Mixvent 800/200 EEXEIIT32 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE3 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x Elta Wall Cowl SWC56/633 x MTP 10, 10K, Speed control2 x Elta Variable Speed Drive IP66 - 2.2KW1 x Transformer 5 Speed Controller - ATC1-2TK3 x Vent Axia Silent 100T (TIMER)2 x Transformer (silent) speed controller - RE 5.0 Amp1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR2 x EBM-Papst D4E225-BC01-17 Double inlet1 x CBM 9-9 550w 4P VR (Open Motor)3 x Transformer Speed Control - RTRE- 1.5Amp1 x Speed Controller - REB1-N1 x Two Speed Switch - REGUL-21 x MTS10- extractor fan 3 step switch1 x QPTW 250C Acoustic Twin Fan with Controller1 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x Elta Wall Cowl SWC35/401 x GRA-100 External Grill by S&P1 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Vent Axia ACM 200 inline mixed flow duct fan1 x REE-2 Electronic Speed Controller1 x DDMP 10-08 3F 2210W M6A4 DG01 x REB-CVF 0-10v Controller1 x Silent 100 Window Kit - windowS1 x Helios HQW-250/4 - IP551 x Transformer speed controller - ATC1 - 1.5 Amps1 x Elta Wall Cowl SWC45/501 x Elta Louvre Shutter - 400mm1 x Elta 10 Amp Electronic single phase speed controller.1 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)1 x CBA-60 Inlet Flange for CBT-601 x Elta Wall Cowl SWC25/311 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR1 x MEV Spider Wireless boost Switch - MEV-SWH-W1 x Isolator Switch - ISOSW2 x PIR Sensor - PIR21 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x RDH FLEX-SQUARE - ADH/RDH 0450
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