• 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 Run On Timer - 5s - 4hrs - RT5A1 x Remote Timer Control - 13511 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)2 x CS2 Current Switch4 x Single phase speed controller by auto-transformer - RMB 1.5 Amp2 x Isolator Switch - ISOSW1 x MV-B Dual Switch for use with Helios HQW plate fans,1 x Time Delay Unit - DT20B3 x COM-31 x Multi Input Run On Timer - 0 - 20min - CFCU2 x MWS 3 – Transformer Controller With Motor Protection1 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp2 x TG-K3/NTC10-01 - Duct temperature sensor2 x Systemair Save Connect 2.0 Internet Module2 x TG-K Duct temperature sensor1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x Elta ACO Panel 149-ACO14E3 x Elta 6 Amp Electronic single phase speed controller with TK2 x Isolator Switch - EFF-ISO1 x ACO 149-ACO1/EDV3 x TG-R room temperature sensor1 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x Vent Axia Silent 100T (TIMER)2 x Helios HQW-200/2 - IP551 x Elta ACO Panel 149-ACO18B1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x BEAS-control module1 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x Transformer Speed Control - RTRE- 7.0Amp1 x EC-Vent Room Unit1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection2 x MWS 1.5 – Transformer Controller With Motor Protection1 x Speed Controller - REB101 x EM30-24 Control Panel Commissioning Service1 x PIR Sensor - PIR21 x Elta - Room Sensor - Temp/Humid/C021 x Elta 6 Amp Electronic single phase speed controller.1 x EC6H - Reversible Group Fan Electronic Controller2 x Envirovent G4 Filter - SL-G4/F71 x WS - Reversing Switch from Helios Fans1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS1 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan1 x Helios TSW 7.5 Amp Transformer speed controller1 x Vent Axia ACM 100 inline mixed flow duct fan1 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Transformer 5 Speed Controller - ATC1-12TK1 x Transformer 5 Speed Controller - ATC1-4TK1 x Helios HQW-200/4 - IP551 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x RDH FLEX-SQUARE - ADH/RDH 04501 x Transformer (silent) speed controller - RE 1.5 Amp1 x Elta Variable Speed Drive IP66 - 2.2KW1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Silent 100 Window Kit - windowS2 x MTP 10, 10K, Speed control
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