• 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 Duct Termination with Mesh - 100mm1 x Elta Variable Speed Drive IP66 - 7.5KW1 x Elta Variable Speed Drive IP66 - 2.2KW1 x FU 075 52 Frequency Inverter (IP20)1 x FU 22 25 Frequency Inverter1 x Helios TSD 5.5 Transformer Speed Control (400v)1 x FRQ5-4A V2 Inverter Speed Controller1 x FU 15 40 Frequency Inverter1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP664 x Elta Variable Speed Drive IP66 - 0.75KW1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x Frequency converter RUCK - FU 075 381 x ELTA - Three Phase Transformer 3amps1 x ELTA - Three Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)2 x Elta 10 Amp Electronic single phase speed controller.1 x FRQ5-10A Inverter Speed controller1 x NKS-D swirl diffuser v-300 x 300mm1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)1 x Circular Ceiling Diffuser - TST 1251 x PCA Diffuser - PCA-3151 x Circular Ceiling Diffuser - TST 2001 x Balance S Diffuser - NO RING - 125mm1 x Circular Ceiling Diffuser - TST 1001 x Round ceiling diffuser 400mm4 x Electronic extractor fan speed controller - FSC 1.51 x Circular Ceiling Diffuser - TST 1601 x EC6H - Reversible Group Fan Electronic Controller1 x JSR 200 Painted RAL50181 x Versio Square Ceiling Diffusers - RS144 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 16amps1 x EFSC-3N- Single Phase Speed Control1 x Elta 3 Amp Electronic single phase speed controller with TK1 x Elta 2 Amp Electronic single phase speed controller.1 x Balance S Diffuser - NO RING - 100mm1 x Round ceiling diffuser 300mm3 x Airvent ceiling fan controller1 x Round ceiling diffuser 200mm1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 8amps1 x ELTA - Single Phase Transformer 4amps1 x AIRVENT speed control - AIR4019611 x Round ceiling diffuser 350mm4 x COM-31 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x EFSC-6N- Single Phase Speed Control1 x PCA Diffuser - PCA-2501 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)1 x Elta 6 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)3 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A1 x EC-Vent Room Unit5 x Systemair Save Connect 2.0 Internet Module1 x Elta ACO Panel 149-ACO18B1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x EM30-24 Control Panel Commissioning Service1 x Easy-fix termination kit - High Rise Ventilator - EFT4 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x Elta Wall Cowl SWC56/631 x Elta Wall Cowl SWC35/401 x GRA-100 External Grill by S&P1 x Elta Wall Cowl SWC25/311 x Elta Wall Cowl SWC45/501 x Elta Louvre Shutter - 400mm1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7101 x Jet Cowl - 315mm1 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3001 x Egg Crate Grille with Dust panel filter 1 inch- 595x5953 x Three Phase Transformer controllers - RMT 1.5 Amp1 x REB-CVF 0-10v Controller1 x Non Vision 150mm x 150mm (Air Transfer) Grille - With Flange - MILL FINISH1 x Mini Diffuser - 100mm3 x Remote controller FLEX - for VEKO INT3 x Helios TSW 7.5 Amp Transformer speed controller1 x ELTA - Single Phase Transformer 2amps1 x ELTA - Single Phase Transformer 12amps1 x Time Delay Unit - DT20B2 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller2 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven2 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 x CONTROL ECOWATT - Basic1 x EM30-24 Electro-Mechanical Control Panel1 x ACO 149-ACO1/EDV2 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection2 x CBS-60 Outlet Flange for CSB/CBT-602 x Transformer 5 Speed Controller - ATC1-4TK2 x Helios TSW 0.3Amp Compact Transformer speed controller4 x Vent Axia ACM 150 inline mixed flow duct fan2 x Push Timer Switch - ZA42 x Helios TSW 1.5 Amp Transformer speed controller4 x Vent Axia ACM 100 inline mixed flow duct fan6 x Vent Axia ACM 125 inline mixed flow duct fan5 x Single phase speed controller by auto-transformer - RMB 1.5 Amp4 x Isolator Switch - ISOSW4 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)2 x BEAS-control module4 x WS - Reversing Switch from Helios Fans2 x Helios HQW-200/2 - IP554 x MWS 1.5 – Transformer Controller With Motor Protection3 x Envirovent G4 Filter - SL-G4/F74 x Vent Axia T-Series Controller6 x Transformer (silent) speed controller - RE 3.0 Amp2 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted2 x RDS 11 Helios Transformer Controller With Motor Protection3 x Helios TSW MCB Amp Transformer speed controller4 x MWS 3 – Transformer Controller With Motor Protection1 x FAST-TRACK RANGE 90mm - Click Ring (1 bag of 10)1 x Speed Controller - REB32 x Transformer (silent) speed controller - RE 1.5 Amp2 x Skyflow SSR Horizontal Roof Cowl SSR31/35B2 x Speed Controller - REB52 x Transformer 5 Speed Controller - ATC1-10TK2 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)2 x Speed Controller - REB102 x Quietflow SQS400-1ECL - Centrifugal Box Fan2 x Transformer 5 Speed Controller - ATC1-2TK4 x Vent Axia ACM 200 inline mixed flow duct fan2 x Multi Input Run On Timer - 0 - 20min - CFCU6 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan3 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE3 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x DEF-140T Inlet Guard for the CBT-100N3 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost2 x Transformer 5 Speed Controller - ATC1-8TK1 x Three Phase 3 step - 10amp Transformer controller for use with the HV Wall Mounted fans.3 x CS2 Current Switch1 x ERR 20/1 Centrifugal inline fan1 x FAST-TRACK RANGE 90mm - Adaptor For Distribution Box3 x Helios HQW-630/4 - IP556 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan4 x Helios TSW 3 Amp Transformer speed controller2 x TG-K Duct temperature sensor3 x TG-K3/NTC10-01 - Duct temperature sensor3 x Helios HQW-200/4 - IP552 x Envirovent 4 Way Remote Control Switch - SWHBKRF-43 x Temperature Fan Speed Controller - ATCP4-WMS3 x Transformer 5 Speed Controller - ATC1-12TK4 x MV-B Dual Switch for use with Helios HQW plate fans,1 x TD EVO-100 PF ECOWATT - Environmentally Friendly Energy Efficient Inline Fan1 x Two Speed Switch - REGUL-23 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Transformer Speed Control - RTRE- 12.0Amp2 x REE-1 Electronic Speed Controller4 x RRB- transformer controller1 x TEM 075 - 5 Speed Transformer Speed Control1 x RDS 7 Helios Transformer Controller With Motor Protection2 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x TG-R room temperature sensor2 x Transformer (silent) speed controller - RE 5.0 Amp2 x Isolator Switch - EFF-ISO1 x Transformer Speed Control - RTRE- 7.0Amp
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