• 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 Elta 10 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 2amps3 x Electronic extractor fan speed controller - FSC 1.51 x EC6H - Reversible Group Fan Electronic Controller1 x Elta 2 Amp Electronic single phase speed controller.1 x EFSC-3N- Single Phase Speed Control2 x Elta 3 Amp Electronic single phase speed controller with TK1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 8amps4 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 16amps1 x Airvent ceiling fan controller1 x ELTA - Single Phase Transformer 12amps1 x AIRVENT speed control - AIR4019614 x COM-31 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x ELTA - Single Phase Transformer 4amps1 x EFSC-6N- Single Phase Speed Control1 x Elta 6 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 10amps1 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B3 x Multi Input Run On Timer - 0 - 20min - CFCU1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 x Elta Variable Speed Drive IP66 - 7.5KW1 x Elta Variable Speed Drive IP66 - 2.2KW1 x FU 15 40 Frequency Inverter1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x FRQ5-4A V2 Inverter Speed Controller1 x FU 22 25 Frequency Inverter1 x FU 075 52 Frequency Inverter (IP20)1 x Elta Variable Speed Drive IP66 - 0.75KW1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP661 x Elta Variable Speed Drive IP66 - 1.5KW1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x FRQ5-10A Inverter Speed controller1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x NKS-D swirl diffuser v-300 x 300mm1 x Curved Blade Grille 600x600 (2way blow)1 x Round ceiling diffuser 400mm1 x JSR 200 Painted RAL50181 x Circular Ceiling Diffuser - 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ISOSW1 x BEAS-control module1 x Helios HQW-200/2 - IP554 x WS - Reversing Switch from Helios Fans5 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Helios TSW 0.3Amp Compact Transformer speed controller3 x Three Phase Transformer controllers - RMT 1.5 Amp4 x Systemair Save Connect 2.0 Internet Module2 x Helios TSW 1.5 Amp Transformer speed controller5 x Vent Axia ACM 125 inline mixed flow duct fan3 x Transformer speed controller - ATC1 - 1.5 Amps3 x CS2 Current Switch1 x Helios TSW MCB Amp Transformer speed controller3 x MWS 3 – Transformer Controller With Motor Protection4 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x TTC-2000 Three phase electric heater controller1 x TG-K Duct temperature sensor1 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)3 x MWS 1.5 – Transformer Controller With Motor Protection2 x Single phase speed controller by auto-transformer - RMB 8.0 Amp4 x Transformer (silent) speed controller - RE 3.0 Amp2 x Helios HQW-200/4 - IP551 x Speed Controller - REB51 x REE-1 Electronic Speed Controller2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-41 x Temperature Fan Speed Controller - ATCP4-WMS2 x Vent Axia ACM 100 inline mixed flow duct fan2 x MV-B Dual Switch for use with Helios HQW plate fans,1 x EC-Vent Room Unit1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x Easy-fix termination kit - High Rise Ventilator - EFT1 x EM30-24 Control Panel Commissioning Service2 x TG-K3/NTC10-01 - Duct temperature sensor1 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE1 x Envirovent G4 Filter - SL-G4/F71 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x Vent Axia T-Series Controller1 x Transformer Speed Control - RTRE- 12.0Amp1 x Isolator Switch - EFF-ISO2 x Transformer 5 Speed Controller - ATC1-12TK1 x Two Speed Switch - REGUL-21 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x TG-R room temperature sensor
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