• 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 WS - Reversing Switch from Helios Fans2 x Transformer Speed Control - RTRE- 12.0Amp1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x Two Speed Switch - REGUL-22 x Vent Axia T-Series Controller2 x CBS-60 Outlet Flange for CSB/CBT-602 x REE-1 Electronic Speed Controller5 x Transformer (silent) speed controller - RE 3.0 Amp2 x TG-K3/NTC10-01 - Duct temperature sensor1 x Helios HQW-630/4 - IP551 x EC6H - Reversible Group Fan Electronic Controller1 x Remote Timer Control - 13511 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3553 x Helios HQW-200/4 - IP553 x Commercial Single or 3 phase Fan Reversing Switch - RS13 x Airvent ceiling fan controller1 x Transformer (silent) speed controller - RE 1.5 Amp3 x Transformer Speed Control - RTRE- 7.0Amp1 x Elta Wall Cowl SWC56/634 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x CBA-60 Inlet Flange for CBT-603 x Helios HQW-315/4 - IP552 x Speed Controller - REB51 x CBM 9-9 550w 4P VR (Open Motor)5 x Transformer Speed Control - RTRE- 1.5Amp3 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)2 x Elta Variable Speed Drive IP66 - 0.75KW1 x MTS10- extractor fan 3 step switch1 x Elta Wall Cowl SWC35/401 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x Multiflow SMB550/4-1AC1 x GRA-100 External Grill by S&P2 x EBM-Papst D4E225-BC01-17 Double inlet1 x Elta Wall Cowl SWC45/503 x SG-200 Fan Guard for the HQW 2002 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR2 x Vent Axia ACM 200 inline mixed flow duct fan1 x Elta Wall Cowl SWC25/311 x Elta Louvre Shutter - 400mm3 x REB-CVF 0-10v Controller1 x Transformer (silent) speed controller - RE 5.0 Amp2 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Transformer 5 Speed Controller - ATC1-2TK2 x REE-2 Electronic Speed Controller5 x MTP 10, 10K, Speed control2 x Elta Variable Speed Drive IP66 - 2.2KW2 x Speed Controller - REB104 x QPTW 250C Acoustic Twin Fan with Controller4 x Vent Axia Silent 100T (TIMER)1 x RDS 11 Helios Transformer Controller With Motor Protection2 x Speed Controller - REB1-N2 x TUNE-R-200-3-M1 - Control Damper1 x FRQ5-10A Inverter Speed controller1 x DDMP 12-12 3F 1810W M6A4 DG01 x Contactor Interface Station - CI92 x EBM-Papst D3G133-BF05-14 Double inlet1 x CBM Low Pressure Centrifugal Fan - CBM 9/7 4 Pole 373watt CVR3 x Helios HQW-250/4 - IP554 x Speed Controller - REB12 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x Jet Cowl - 315mm1 x VTR 300 STD Filter Kit1 x Biflow SB400-CON2-3 - High Temperature Bifurcated Fan1 x Silent 100 Window Kit - windowS1 x 7 Day Programmable TIMECLOCK1 x Speed controller with Reverse - REB-1R1 x DDMP 10-08 3F 2210W M6A4 DG02 x PIR Sensor - PIR21 x GXC6EC - High Performance Extract Fan1 x Elta 6 Amp Electronic single phase speed controller.1 x Compact SCD450/4-1AC
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