• 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 Helios TSD 3.0 Transformer Speed Control (400v)1 x FRQ5-4A V2 Inverter Speed Controller1 x FRQ-10A V2 Inverter Speed controller3 x Elta Variable Speed Drive IP66 - 2.2KW1 x FU 075 52 Frequency Inverter (IP20)1 x NKS-D swirl diffuser v-300 x 300mm1 x FU 15 40 Frequency Inverter1 x FU 22 25 Frequency Inverter2 x Helios TSW 0.3Amp Compact Transformer speed controller1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x Elta Variable Speed Drive IP66 - 5.5KW1 x FU 15 16 Frequency Inverter1 x Circular Ceiling Diffuser - TST 1253 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter RUCK - FU 075 202 x Elta 10 Amp Electronic single phase speed controller.1 x Frequency converter FU 075 14 - IP663 x Elta Variable Speed Drive IP66 - 0.75KW1 x Circular Ceiling Diffuser - TST 1001 x Circular Ceiling Diffuser - TST 2001 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter2 x FRQ5-10A Inverter Speed controller1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x ELTA - Three Phase Transformer 3amps1 x PCA Diffuser - PCA-3151 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x Round ceiling diffuser 400mm1 x FU 075 04 Frequency Inverter (IP20)1 x JSR 200 Painted RAL50181 x Curved Blade Grille 600x600 (2way blow)1 x Balance S Diffuser - NO RING - 125mm1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER2 x Helios TSW 1.5 Amp Transformer speed controller1 x Balance S Diffuser - NO RING - 100mm1 x ELTA - Single Phase Transformer 2amps1 x Circular Ceiling Diffuser - TST 1603 x Round ceiling diffuser 200mm4 x Electronic extractor fan speed controller - FSC 1.52 x Round ceiling diffuser 300mm3 x EC6H - Reversible Group Fan Electronic Controller1 x Round ceiling diffuser 350mm1 x Round ceiling diffuser 250mm3 x Elta 6 Amp Electronic single phase speed controller with TK1 x EFSC-3N- Single Phase Speed Control1 x Elta 3 Amp Electronic single phase speed controller.2 x Elta 3 Amp Electronic single phase speed controller with TK1 x Elta 2 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 16amps1 x ELTA - Single Phase Transformer 8amps2 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x ELTA - Single Phase Transformer 12amps1 x ELTA - Single Phase Transformer 4amps3 x AIRVENT speed control - AIR4019611 x Airvent ceiling fan controller2 x Elta 6 Amp Electronic single phase speed controller.3 x COM-32 x Remote Timer Control - 13511 x EFSC-6N- Single Phase Speed Control1 x Run On Timer - 5s - 4hrs - RT5A1 x ELTA - Single Phase Transformer 10amps4 x Multi Input Run On Timer - 0 - 20min - CFCU3 x Push Timer Switch - ZA42 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B2 x 7 Day Programmable TIMECLOCK3 x Helios HQW-200/2 - IP551 x TTC-2000 Three phase electric heater controller1 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 U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection2 x REB-CVF 0-10v Controller1 x EM30-24 Electro-Mechanical Control Panel1 x EC-Vent Room Unit3 x Systemair Save Connect 2.0 Internet Module1 x Elta ACO Panel 149-ACO18B1 x UB47- Universal Insulated Terminal1 x Egg Crate Grille with Dust panel filter 1 inch- 595x5951 x Single Deflection Grille 400mm with OBD damper1 x Helios ESA-1 Surface mounted Speed Control 1amp1 x Non Vision 150mm x 150mm (Air Transfer) Grille - With Flange - MILL FINISH3 x Mini Diffuser - 100mm5 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan3 x Remote controller FLEX - for VEKO INT2 x Transformer 5 Speed Controller - ATC1-4TK2 x Transformer 5 Speed Controller - ATC1-12TK3 x Three Phase Transformer controllers - RMT 1.5 Amp2 x Vent Axia ACM 150 inline mixed flow duct fan2 x Transformer speed controller - ATC1 - 1.5 Amps2 x Vent Axia ACM 200 inline mixed flow duct fan1 x Isolator Switch - ISOSW2 x Vent Axia ACM 125 inline mixed flow duct fan1 x Single phase speed controller by auto-transformer - RMB 1.5 Amp2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x TG-K Duct temperature sensor2 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven2 x Vent Axia T-Series Controller1 x Envirovent G4 Filter - SL-G4/F74 x Transformer (silent) speed controller - RE 3.0 Amp2 x Speed Controller - REB52 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)3 x TG-K3/NTC10-01 - Duct temperature sensor1 x Transformer (silent) speed controller - RE 5.0 Amp2 x Speed Controller - REB1-N2 x Speed Controller - REB12 x MTS10- extractor fan 3 step switch1 x Commercial Single or 3 phase Fan Reversing Switch - RS12 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT2 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)4 x MTP 10, 10K, Speed control1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Helios PU10 Speed Potentiometer (Flush Mounted)3 x PIR Sensor - PIR22 x MEV Spider Wireless boost Switch - MEV-SWH-W1 x VTR 300 STD Filter Kit1 x Easy-fix termination kit - High Rise Ventilator - EFT2 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x CBT-100N Centrifugal2 x Contactor Interface Station - CI91 x Speed Controller - REB2.5-N1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6302 x PIR Sensor - PIR41 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x Helios HQW-250/4 - IP551 x SG-200 Fan Guard for the HQW 2001 x EM30-24 Control Panel Commissioning Service3 x QPTW 250C Acoustic Twin Fan with Controller2 x Silentub - STUB 1001 x VEKA INT 2000/15.0-L1 EKO1 x Elta Wall Cowl SWC56/632 x SAVE VSR 300 heat recovery unit1 x Elta Wall Cowl SWC35/402 x Vent Axia ACM 100 inline mixed flow duct fan1 x Compact SCD450/4-1AC1 x Elta Wall Cowl SWC45/502 x Elta - Room Sensor - Temp/Humid/C021 x GRA-100 External Grill by S&P1 x Elta Wall Cowl SWC25/311 x Silentub - STUB 2001 x CFI In-line 150 - Carbon Filter1 x 100mm Round Connector with Damper1 x Elta SCP400/4-1AC - IP551 x Duct Termination with Mesh - 100mm1 x AXC TP - 100mm Plastic Centrifugal Inline Fan1 x CBB-60N Centrifugal1 x Universal Pipe Fixing Clip1 x Helios SVR EC 160 B – SlimVent Centrifugal Fan Box1 x Flat Roof Terminal -OFT 5 - Asphalt1 x RUCK MTP 20, 10K, Speed control1 x MEV Spider Additional Spigots1 x Duct Termination with Mesh - 150mm1 x Quietflow Twin SQTDCV250-1ECL2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-44 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x CPTA-E Flush mounted PIR sensor with timer1 x Transformer 5 Speed Controller - ATC1-2TK2 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE2 x Helios TSW 3 Amp Transformer speed controller1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Helios TSW 7.5 Amp Transformer speed controller1 x RTRD - Three Phase Speed Controller - 2 Amp2 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-8TK2 x CS2 Current Switch2 x DEF-140T Inlet Guard for the CBT-100N1 x MV-B Dual Switch for use with Helios HQW plate fans,1 x ERR 20/1 Centrifugal inline fan1 x Two Speed Switch - REGUL-23 x WS - Reversing Switch from Helios Fans2 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Transformer Speed Control - RTRE- 12.0Amp1 x REE-1 Electronic Speed Controller1 x Speed Controller - REB31 x MWS 3 – Transformer Controller With Motor Protection2 x Helios HQW-630/4 - IP551 x Speed Controller - REB101 x Helios HQW-200/4 - IP551 x Transformer Speed Control - RTRE- 5.0Amp2 x TG-R room temperature sensor1 x CBS-60 Outlet Flange for CSB/CBT-601 x Transformer (silent) speed controller - RE 1.5 Amp1 x BEAS-control module1 x Vortice Quadro Micro 100 I - Standard Version1 x DEF-CBM-RE-7 - Protection Guard1 x CBM 9-9 550w 4P VR (Open Motor)1 x Transformer Speed Control - RTRE- 7.0Amp1 x CBA-60 Inlet Flange for CBT-601 x MWS 1.5 – Transformer Controller With Motor Protection1 x Helios HQW-315/4 - IP551 x TD Mixvent 800/200 EEXEIIT31 x Rectangular Airbrick Adaptor1 x Speed Controller - REB81 x DDMP 09/09 Mounting Flange1 x Silent 100 Window Kit - windowS1 x DA9/9-NT1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR1 x Singleflow SSDL315-1EC1 x Quietflow SQS400-1ECL - Centrifugal Box Fan1 x TD160-NT Mixvent - 100mm - TD160 Timer2 x Vent Axia Silent 100T (TIMER)1 x DDMP 12-12 3F 1810W M6A4 DG01 x Elta Louvre Shutter - 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Reviews
Transformer (silent) speed controller - RE 1.5 Amp
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Unbelievable! With TDmixvent500: noise reduction minimum 50%...