• 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

2 x WS - Reversing Switch from Helios Fans2 x MWS 1.5 – Transformer Controller With Motor Protection1 x EM30-24 Electro-Mechanical Control Panel1 x Elta 3 Amp Electronic single phase speed controller with TK2 x Transformer (silent) speed controller - RE 1.5 Amp1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection3 x Electronic extractor fan speed controller - FSC 1.52 x Helios HQW-200/2 - IP551 x EC-Vent Room Unit1 x Vent Axia T-Series Controller1 x Transformer Speed Control - RTRE- 12.0Amp2 x Systemair Save Connect 2.0 Internet Module1 x Single phase speed controller by auto-transformer - RMB 8.0 Amp1 x TG-K Duct temperature sensor3 x TG-K3/NTC10-01 - Duct temperature sensor3 x Transformer (silent) speed controller - RE 3.0 Amp2 x Two Speed Switch - REGUL-22 x Helios HQW-200/4 - IP551 x Vent Axia ACM 125 inline mixed flow duct fan1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp3 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE2 x Helios HQW-630/4 - IP552 x Vent Axia Silent 100T (TIMER)1 x BEAS-control module1 x Remote Timer Control - 13511 x EM30-24 Control Panel Commissioning Service1 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven1 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x QPTW 250C Acoustic Twin Fan with Controller2 x EBM-Papst D4E225-BC01-17 Double inlet1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Transformer Speed Control - RTRE- 7.0Amp2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR2 x CBS-60 Outlet Flange for CSB/CBT-601 x TD Mixvent 800/200 EEXEIIT31 x Elta 6 Amp Electronic single phase speed controller.1 x Airvent ceiling fan controller1 x Speed controller with Reverse - REB-1R1 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Silent 100 Window Kit - windowS2 x Transformer 5 Speed Controller - ATC1-2TK1 x PIR Sensor - PIR22 x SG-200 Fan Guard for the HQW 2002 x Helios HQW-250/4 - IP551 x Speed Controller - REB102 x RDH FLEX-SQUARE - ADH/RDH 04502 x CBA-60 Inlet Flange for CBT-601 x Elta Variable Speed Drive IP66 - 2.2KW1 x Quietflow SQS400-1ECL - Centrifugal Box Fan1 x DDMP 12-12 3F 1810W M6A4 DG01 x REB-CVF 0-10v Controller1 x Transformer 5 Speed Controller - ATC1-4TK1 x MTS10- extractor fan 3 step switch1 x Speed Controller - REB11 x ELM 18 EX Flexible Cuff for ERM 181 x HIMF - Mixed Flow Fan 100mm Inline Fan1 x Helios HQW-315/4 - IP551 x Elta Variable Speed Drive IP66 - 0.75KW1 x RD35S-4DW.6W.3L - 122297 (Three Phase)1 x Multiflow SMB550/4-1AC1 x VTR 300 STD Filter Kit1 x CBT-100N Centrifugal1 x CMT-2 120/50 - 0,09Kw - LG270 Single inlet centrifugal fan direct driven1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)
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