• 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 Helios HQW-630/4 - IP551 x 7 Day Programmable TIMECLOCK3 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x Skyflow SSR Horizontal Roof Cowl SSR80B1 x Remote Timer Control - 13513 x REB-CVF 0-10v Controller1 x Helios HQW-200/4 - IP551 x CBA-60 Inlet Flange for CBT-602 x MEV Spider Wireless boost Switch - MEV-SWH-W2 x RDH FLEX-SQUARE - ADH/RDH 04501 x Transformer Speed Control - RTRE- 12.0Amp1 x Transformer (silent) speed controller - RE 5.0 Amp2 x Speed Controller - REB103 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Isolator Switch - EFF-ISO1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x Transformer Speed Control - RTRE- 7.0Amp1 x TD Mixvent 800/200 EEXEIIT34 x QPTW 250C Acoustic Twin Fan with Controller1 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x Speed Controller - REB53 x SG-200 Fan Guard for the HQW 2004 x Helios HQW-315/4 - IP553 x Helios HQW-250/4 - IP551 x Elta Variable Speed Drive IP66 - 2.2KW2 x Silent 100 Window Kit - windowS5 x Speed Controller - REB11 x Transformer (silent) speed controller - RE 1.5 Amp1 x GRA-100 External Grill by S&P4 x MTP 10, 10K, Speed control1 x FRQ5-10A Inverter Speed controller2 x Speed Controller - REB1-N3 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x Elta Wall Cowl SWC35/401 x Elta Louvre Shutter - 400mm2 x VTR 300 STD Filter Kit3 x Vent Axia Silent 100T (TIMER)1 x Elta Wall Cowl SWC45/502 x UB47- Universal Insulated Terminal1 x Elta Wall Cowl SWC25/314 x Transformer Speed Control - RTRE- 1.5Amp1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR4 x PIR Sensor - PIR42 x EBM-Papst D4E225-BC01-17 Double inlet2 x Elta 6 Amp Electronic single phase speed controller.2 x Speed Controller - REB84 x PIR Sensor - PIR21 x GXC6EC - High Performance Extract Fan1 x CBT-100N Centrifugal1 x Speed Controller - REB2.5-N1 x Quietflow SQS100-1ECL - Centrifugal Box Fan3 x Elta - Room Sensor - Temp/Humid/C021 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7101 x Contactor Interface Station - CI92 x Elta Variable Speed Drive IP66 - 1.5KW1 x Jet Cowl - 315mm1 x SAVE VSR 300 heat recovery unit1 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3003 x DDMP 10-08 3F 2210W M6A4 DG01 x AIRVENT speed control - AIR4019611 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR2 x Mini Diffuser - 100mm1 x CBM Low Pressure Centrifugal Fan - CBM 9/7 4 Pole 373watt CVR1 x TG-K Duct temperature sensor1 x Biflow SB400-CON2-3 - High Temperature Bifurcated Fan1 x Isolator Switch - ISOSW1 x Silentub - STUB 1001 x MV-B Dual Switch for use with Helios HQW plate fans,1 x Vent Axia SC5001 - Speed controller1 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x Elta 10 Amp Electronic single phase speed controller.1 x ELM 18 EX Flexible Cuff for ERM 181 x Airvent ceiling fan controller1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x DDMP 12-12 3F 1810W M6A4 DG01 x EBM-Papst D3G133-BF05-14 Double inlet1 x Duct Termination with Mesh - 355mm1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost
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