• 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 Variable Speed Drive IP66 - 2.2KW1 x FU 15 40 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 7.5KW1 x FU 22 25 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 075 52 Frequency Inverter (IP20)1 x FRQ5-4A V2 Inverter Speed Controller1 x FRQ-10A V2 Inverter Speed controller1 x FU 15 16 Frequency Inverter1 x FRQ5-10A Inverter Speed controller1 x Elta Variable Speed Drive IP66 - 5.5KW1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP661 x FU 22 04 Frequency Inverter1 x Frequency converter RUCK - FU 075 211 x FU 075 04 Frequency Inverter (IP20)1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x Elta 10 Amp Electronic single phase speed controller.1 x ELTA - Three Phase Transformer 10amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x ELTA - Single Phase Transformer 2amps3 x Electronic extractor fan speed controller - FSC 1.51 x NKS-D swirl diffuser v-300 x 300mm1 x PCA Diffuser - PCA-3152 x EC6H - Reversible Group Fan Electronic Controller1 x Balance S Diffuser - NO RING - 125mm1 x Circular Ceiling Diffuser - TST 1251 x 5-Speed Controller for use with Elta SAX Classic Fans4 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 2 Amp Electronic single phase speed controller.1 x Circular Ceiling Diffuser - TST 1001 x ELTA - Single Phase Transformer 12amps1 x Circular Ceiling Diffuser - TST 1601 x Elta 3 Amp Electronic single phase speed controller.5 x Elta 6 Amp Electronic single phase speed controller with TK1 x EFSC-3N- Single Phase Speed Control1 x JSR 200 Painted RAL50182 x Airvent ceiling fan controller1 x ELTA - Single Phase Transformer 16amps1 x ELTA - Single Phase Transformer 8amps1 x Round ceiling diffuser 400mm1 x AIRVENT speed control - AIR4019613 x COM-31 x ELTA - Single Phase Transformer 4amps1 x Round ceiling diffuser 300mm1 x EFSC-6N- Single Phase Speed Control1 x Round ceiling diffuser 200mm1 x Balance S Diffuser - NO RING - 100mm1 x Elta 6 Amp Electronic single phase speed controller.1 x Round ceiling diffuser 350mm1 x ELTA - Single Phase Transformer 10amps1 x Round ceiling diffuser 250mm1 x Remote Timer Control - 13513 x Vent Axia ACM 100 inline mixed flow duct fan1 x Run On Timer - 5s - 4hrs - RT5A3 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer1 x 7 Day Programmable TIMECLOCK3 x Multi Input Run On Timer - 0 - 20min - CFCU1 x TTC-2000 Three phase electric heater controller1 x ACO8AC/EC AutoChangeover panel2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x Elta ACO Panel 149-ACO14E2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x TG-K Duct temperature sensor1 x CONTROL ECOWATT - Basic3 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x EM30-24 Electro-Mechanical Control Panel1 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan1 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x ACO 149-ACO1/EDV2 x Transformer 5 Speed Controller - ATC1-12TK5 x Vent Axia ACM 125 inline mixed flow duct fan1 x Elta ACO Panel 149-ACO18B1 x Speed Controller - REB82 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x DEF-140T Inlet Guard for the CBT-100N2 x Transformer 5 Speed Controller - ATC1-4TK2 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-8TK1 x Elta - Room Sensor - Temp/Humid/C022 x Helios TSW 3 Amp Transformer speed controller3 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Temperature Fan Speed Controller - ATCP4-WMS2 x Remote controller FLEX - for VEKO INT2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans3 x Three Phase Transformer controllers - RMT 1.5 Amp3 x CS2 Current Switch3 x MWS 3 – Transformer Controller With Motor Protection2 x Helios HQW-200/2 - IP552 x BEAS-control module2 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted4 x MWS 1.5 – Transformer Controller With Motor Protection2 x Envirovent G4 Filter - SL-G4/F74 x WS - Reversing Switch from Helios Fans2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-42 x Vent Axia ACM 150 inline mixed flow duct fan3 x Isolator Switch - ISOSW2 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven3 x Systemair Save Connect 2.0 Internet Module1 x EC-Vent Room Unit1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x EM30-24 Control Panel Commissioning Service2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Helios TSW 7.5 Amp Transformer speed controller2 x Helios TSW MCB Amp Transformer speed controller3 x MV-B Dual Switch for use with Helios HQW plate fans,1 x Helios TSW 1.5 Amp Transformer speed controller2 x Helios HQW-630/4 - IP551 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6302 x Helios TSW 10 Amp Transformer speed controller1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT2 x TG-K3/NTC10-01 - Duct temperature sensor2 x Vent Axia T-Series Controller2 x Transformer (silent) speed controller - RE 3.0 Amp2 x Helios HQW-200/4 - IP551 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Multiflow SMB550/4-1AC1 x Transformer (silent) speed controller - RE 1.5 Amp1 x Easy-fix termination kit - High Rise Ventilator - EFT1 x Transformer Speed Control - RTRE- 12.0Amp1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS1 x REE-1 Electronic Speed Controller
Reviews
Circular Inline Silencers - 0.6M long - SLU-600
Circular Inline Silencers - 0.6M long - SLU-600
£ 58.40

I have a loft mount extractor fan which was very noisy. I ...