• 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 Commercial Single or 3 phase Fan Reversing Switch - RS12 x Elta 6 Amp Electronic single phase speed controller.2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x WS - Reversing Switch from Helios Fans1 x Temperature Controller - EDTW1 x TTC-2000 Three phase electric heater controller2 x ACOAS/ AC/EC Auto Changeover 8Amp1 x ACO8AC/EC AutoChangeover panel1 x Elta ACO Panel 149-ACO14E5 x Speed Controller - REB1-N1 x CONTROL ECOWATT - Basic1 x EC-Vent control board1 x REB-CVF 0-10v Controller1 x EM30-24 Electro-Mechanical Control Panel1 x Speed Controller - REB13 x Vent Axia Silent 100T (TIMER)1 x Easy-fix termination kit - High Rise Ventilator - EFT2 x QPTW 250C Acoustic Twin Fan with Controller1 x Silentub - STUB 1001 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3001 x Jet Cowl - 315mm1 x Non Vision 150mm x 150mm (Air Transfer) Grille - With Flange - MILL FINISH2 x Compact SCD450/4-1AC2 x Vent Axia ACM 150 inline mixed flow duct fan1 x ELTA - Single Phase Transformer 2amps1 x Electronic extractor fan speed controller - FSC 1.51 x EC6H - Reversible Group Fan Electronic Controller3 x Helios TSW MCB Amp Transformer speed controller1 x 5-Speed Controller for use with Elta SAX Classic Fans2 x Elta 2 Amp Electronic single phase speed controller.1 x Helios TSW 1.5 Amp Transformer speed controller2 x Elta 3 Amp Electronic single phase speed controller with TK2 x Elta 6 Amp Electronic single phase speed controller with TK2 x Airvent ceiling fan controller2 x EFSC-3N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 8amps1 x ELTA - Single Phase Transformer 16amps1 x Elta 3 Amp Electronic single phase speed controller.2 x Vent Axia ACM 200 inline mixed flow duct fan2 x AIRVENT speed control - AIR4019612 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven1 x Two Speed Switch - REGUL-22 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Time Delay Unit - DT20B1 x 7 Day Programmable TIMECLOCK2 x Transformer (silent) speed controller - RE 3.0 Amp1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x Helios HQW-200/4 - IP552 x Speed Controller - REB52 x Transformer (silent) speed controller - RE 1.5 Amp1 x Multiflow SMB550/4-1AC1 x Helios HQW-315/4 - IP551 x ACO 149-ACO1/EDV3 x MTP 10, 10K, Speed control1 x Elta ACO Panel 149-ACO18B1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6302 x Silent 100 Window Kit - windowS1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5002 x MTS10- extractor fan 3 step switch3 x PIR Sensor - PIR41 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x CBT-100N Centrifugal1 x GRA-100 External Grill by S&P1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7101 x CSB-60 Centrifugal fan1 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x Vertical Cowl and Fan (Single Phase) - 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MEV-SWH-W1 x DDMP 12-12 3F 1810W M6A4 DG02 x DEF-CBM-RE-7 - Protection Guard2 x DDMP 09/09 Mounting Flange1 x MWS 1.5 – Transformer Controller With Motor Protection1 x Quietflow SQS100-1ECL - Centrifugal Box Fan1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Singleflow SSDL315-1EC1 x Lo-Carbon Silhouette 100T (Timer)2 x REU 1.5amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost2 x Remote controller FLEX - for VEKO INT1 x Helios TSW 7.5 Amp Transformer speed controller1 x Systemair Save Connect 2.0 Internet Module1 x Remote Timer Control - 13511 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Run On Timer - 5s - 4hrs - RT5A1 x Vent Axia ACM 125 inline mixed flow duct fan1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x ERR 31/1 Centrifugal inline fan2 x Speed Controller - REB31 x TG-K3/NTC10-01 - Duct temperature sensor1 x Speed Controller - REB101 x Speed Controller - REB61 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)1 x Skyflow SSR Horizontal Roof Cowl SSR80B1 x Mini Diffuser - 100mm1 x TUNE-R-200-3-M4 - Control Damper1 x GXC6EC - High Performance Extract Fan1 x Elta Wall Cowl SWC25/311 x LFBR 315 G4 - Helios Inline Filter Box - 315mm1 x TD160-NT Mixvent - 100mm - TD160 Timer2 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Transformer 5 Speed Controller - ATC1-8TK1 x RDS 11 Helios Transformer Controller With Motor Protection1 x Transformer 5 Speed Controller - ATC1-2TK1 x DEF-140T Inlet Guard for the CBT-100N1 x Vent Axia T-Series Controller1 x SG-200 Fan Guard for the HQW 2001 x Helios HQW-250/4 - IP551 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x Speed Controller - REB161 x CBM 9-9 550w 4P VR (Open Motor)1 x Duct Termination with Mesh - 355mm1 x 110 x 54mm Round to Rectangular Adaptor - Long1 x SPI-100 C Iris damper1 x CK-60F Kit1 x CBA-100 Inlet Flange for CBT-1001 x WSD 100 (1060x1060x70)1 x RD35S-4DW.6W.3L - 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Reviews
DAOSL Back Draft Damper
DAOSL Back Draft Damper
£ 11.49

Look good, works well, except the shaft of the lanellae cuts...