• 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

3 x Elta Variable Speed Drive IP66 - 2.2KW1 x Elta Variable Speed Drive IP66 - 7.5KW1 x FRQ5-4A V2 Inverter Speed Controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x FU 15 40 Frequency Inverter1 x FU 22 25 Frequency Inverter1 x FU 075 52 Frequency Inverter (IP20)3 x Elta Variable Speed Drive IP66 - 0.75KW1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x ELTA - Three Phase Transformer 10amps1 x FRQ5-10A Inverter Speed controller1 x ELTA - Three Phase Transformer 3amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x Frequency converter RUCK - FU 075 211 x FU 075 04 Frequency Inverter (IP20)1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp2 x EC-Vent control board1 x CONTROL ECOWATT - Basic1 x ACO 149-ACO1/EDV1 x EM30-24 Electro-Mechanical Control Panel1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5005 x Systemair Save Connect 2.0 Internet Module2 x Frequency converter FU 075 14 - IP661 x Circular Ceiling Diffuser - TST 1001 x Round ceiling diffuser 400mm3 x Electronic extractor fan speed controller - FSC 1.51 x Curved Blade Grille 600x600 (2way blow)1 x JSR 200 Painted RAL50181 x Circular Ceiling Diffuser - TST 1602 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans3 x EC6H - Reversible Group Fan Electronic Controller1 x Round ceiling diffuser 200mm1 x ELTA - Single Phase Transformer 16amps1 x Round ceiling diffuser 300mm1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 8amps2 x Airvent ceiling fan controller1 x Round ceiling diffuser 250mm1 x ELTA - Single Phase Transformer 12amps1 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps1 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x EFSC-6N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 10amps2 x Isolator Switch - ISOSW1 x TTC-2000 Three phase electric heater controller1 x Elta ACO Panel 149-ACO14E6 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan6 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Circular Ceiling Diffuser - TST 1251 x PCA Diffuser - PCA-3151 x Circular Ceiling Diffuser - TST 2001 x Helios ZNE Electronic Fan Overrun Timer3 x Push Timer Switch - ZA44 x CS2 Current Switch1 x Time Delay Unit - DT20B3 x Multi Input Run On Timer - 0 - 20min - CFCU8 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven5 x Elta 6 Amp Electronic single phase speed controller with TK2 x BEAS-control module2 x Envirovent G4 Filter - SL-G4/F71 x Vent Axia T-Series Controller1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT5 x Transformer (silent) speed controller - RE 3.0 Amp1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x Easy-fix termination kit - High Rise Ventilator - EFT2 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x Speed Controller - REB51 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)1 x Elta Wall Cowl SWC56/632 x Quietflow SQS400-1ECL - Centrifugal Box Fan2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-41 x Elta 10 Amp Electronic single phase speed controller.3 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE3 x Remote controller FLEX - for VEKO INT2 x Transformer 5 Speed Controller - ATC1-10TK3 x Transformer 5 Speed Controller - ATC1-4TK2 x Transformer 5 Speed Controller - ATC1-8TK1 x Elta 2 Amp Electronic single phase speed controller.1 x EFSC-3N- Single Phase Speed Control3 x Transformer 5 Speed Controller - ATC1-12TK2 x Vent Axia ACM 150 inline mixed flow duct fan1 x Round ceiling diffuser 350mm2 x COM-31 x PCA Diffuser - PCA-2501 x Vent Axia ACM 100 inline mixed flow duct fan1 x Run On Timer - 5s - 4hrs - RT5A3 x Vent Axia ACM 125 inline mixed flow duct fan5 x Transformer speed controller - ATC1 - 1.5 Amps3 x 7 Day Programmable TIMECLOCK2 x MWS 3 – Transformer Controller With Motor Protection2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x TG-K Duct temperature sensor2 x Elta 3 Amp Electronic single phase speed controller with TK4 x MWS 1.5 – Transformer Controller With Motor Protection2 x Helios HQW-200/2 - IP551 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x RDS 11 Helios Transformer Controller With Motor Protection2 x Helios TSW 3 Amp Transformer speed controller3 x Helios TSW MCB Amp Transformer speed controller4 x Helios TSW 1.5 Amp Transformer speed controller2 x Vent Axia ACM 200 inline mixed flow duct fan2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Two Speed Switch - REGUL-23 x WS - Reversing Switch from Helios Fans3 x Transformer Speed Control - RTRE- 12.0Amp1 x CBS-60 Outlet Flange for CSB/CBT-603 x TG-K3/NTC10-01 - Duct temperature sensor2 x KMBI 315 Connector rectangular/circular to install on the discharge of CMT2 x Transformer (silent) speed controller - RE 1.5 Amp2 x Transformer (silent) speed controller - RE 5.0 Amp1 x NKS-D swirl diffuser v-300 x 300mm2 x Three Phase Transformer controllers - RMT 1.5 Amp3 x Helios HQW-630/4 - IP552 x Helios TSW 7.5 Amp Transformer speed controller2 x DEF-140T Inlet Guard for the CBT-100N1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT2 x Temperature Fan Speed Controller - ATCP4-WMS4 x Transformer 5 Speed Controller - ATC1-2TK4 x Helios HQW-200/4 - IP551 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x RDS 7 Helios Transformer Controller With Motor Protection3 x MV-B Dual Switch for use with Helios HQW plate fans,1 x Remote Timer Control - 13513 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven3 x Speed Controller - REB104 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x Skyflow SSR Horizontal Roof Cowl SSR80B3 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS4 x Helios HQW-315/4 - IP552 x Multiflow SMB550/4-1AC3 x Transformer Speed Control - RTRE- 7.0Amp2 x Helios PU10 Speed Potentiometer (Flush Mounted)3 x SG-200 Fan Guard for the HQW 2003 x Transformer Speed Control - RTRE- 1.5Amp3 x REB-CVF 0-10v Controller2 x CBM 9-9 550w 4P VR (Open Motor)1 x Speed Controller - REB1-N1 x Elta Wall Cowl SWC35/401 x MEV Spider Wireless boost Switch - MEV-SWH-W1 x MTP 10, 10K, Speed control1 x GRA-100 External Grill by S&P1 x CBA-60 Inlet Flange for CBT-601 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x MTS10- extractor fan 3 step switch
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