• 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 FU 15 40 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 7.5KW1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x Helios TSD 5.5 Transformer Speed Control (400v)1 x FRQ-10A V2 Inverter Speed controller1 x FRQ5-4A V2 Inverter Speed Controller1 x FU 075 52 Frequency Inverter (IP20)1 x FU 22 25 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 0.75KW1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP661 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 1.5KW1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x FRQ5-10A Inverter Speed controller1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x ELTA - Three Phase Transformer 3amps1 x FU 075 04 Frequency Inverter (IP20)1 x Frequency converter RUCK - FU 075 381 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x ELTA - Three Phase Transformer 10amps1 x Elta 10 Amp Electronic single phase speed controller.1 x FU 22 04 Frequency Inverter1 x Frequency converter RUCK - FU 075 211 x ELTA - Single Phase Transformer 2amps1 x NKS-D swirl diffuser v-300 x 300mm1 x Electronic extractor fan speed controller - FSC 1.51 x Balance S Diffuser - NO RING - 125mm1 x EC6H - Reversible Group Fan Electronic Controller1 x Circular Ceiling Diffuser - TST 1251 x PCA Diffuser - PCA-3151 x Circular Ceiling Diffuser - TST 1001 x Elta 2 Amp Electronic single phase speed controller.1 x Elta 3 Amp Electronic single phase speed controller with TK1 x Curved Blade Grille 600x600 (2way blow)1 x Circular Ceiling Diffuser - TST 2001 x ELTA - Single Phase Transformer 16amps1 x ELTA - Single Phase Transformer 8amps4 x Elta 6 Amp Electronic single phase speed controller with TK1 x Round ceiling diffuser 400mm1 x Elta 3 Amp Electronic single phase speed controller.1 x EFSC-3N- Single Phase Speed Control1 x JSR 200 Painted RAL50181 x ELTA - Single Phase Transformer 12amps1 x Circular Ceiling Diffuser - TST 1601 x Versio Square Ceiling Diffusers - RS141 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps3 x COM-32 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x Balance S Diffuser - NO RING - 100mm1 x EFSC-6N- Single Phase Speed Control1 x Round ceiling diffuser 200mm1 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)1 x Round ceiling diffuser 300mm1 x Elta 6 Amp Electronic single phase speed controller.1 x PCA Diffuser - PCA-2501 x Round ceiling diffuser 250mm1 x ELTA - Single Phase Transformer 10amps1 x Round ceiling diffuser 350mm1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)1 x Remote Timer Control - 13514 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer3 x Multi Input Run On Timer - 0 - 20min - CFCU2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x Remote controller FLEX - for VEKO INT5 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan7 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Vent Axia ACM 150 inline mixed flow duct fan2 x Helios TSW 7.5 Amp Transformer speed controller2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Transformer 5 Speed Controller - ATC1-4TK1 x Transformer 5 Speed Controller - ATC1-10TK3 x Helios TSW 3 Amp Transformer speed controller2 x Vent Axia ACM 200 inline mixed flow duct fan2 x Vent Axia ACM 100 inline mixed flow duct fan2 x Three Phase Transformer controllers - RMT 1.5 Amp2 x Helios TSW MCB Amp Transformer speed controller1 x Transformer 5 Speed Controller - ATC1-8TK1 x Envirovent 4 Way Remote Control Switch - SWHBKRF-42 x Helios TSW 1.5 Amp Transformer speed controller6 x Vent Axia ACM 125 inline mixed flow duct fan5 x Temperature Fan Speed Controller - ATCP4-WMS2 x MV-B Dual Switch for use with Helios HQW plate fans,4 x CS2 Current Switch7 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)4 x Isolator Switch - ISOSW2 x Systemair Save Connect 2.0 Internet Module2 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 8Amp4 x TG-K Duct temperature sensor1 x Elta ACO Panel 149-ACO14E1 x CONTROL ECOWATT - Basic1 x ACO 149-ACO1/EDV1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Elta ACO Panel 149-ACO18B3 x MWS 1.5 – Transformer Controller With Motor Protection1 x EC-Vent Room Unit1 x TG-K3/NTC10-01 - Duct temperature sensor1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x EM30-24 Control Panel Commissioning Service1 x Helios HQW-630/4 - IP551 x EC-Vent control board1 x EM30-24 Electro-Mechanical Control Panel1 x BEAS-control module1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Vent Axia T-Series Controller2 x WS - Reversing Switch from Helios Fans1 x Airvent ceiling fan controller2 x Helios HQW-200/4 - IP551 x Transformer 5 Speed Controller - ATC1-12TK1 x Single phase speed controller by auto-transformer - RMB 3.5 Amp
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