• 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

2 x TG-K Duct temperature sensor1 x Time Delay Unit - DT20B1 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)3 x Single phase speed controller by auto-transformer - RMB 8.0 Amp4 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x 7 Day Programmable TIMECLOCK1 x MWS 3 – Transformer Controller With Motor Protection1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x COM-31 x CS2 Current Switch2 x Isolator Switch - ISOSW4 x MWS 1.5 – Transformer Controller With Motor Protection1 x BEAS-control module2 x Helios HQW-200/2 - IP553 x WS - Reversing Switch from Helios Fans1 x Elta ACO Panel 149-ACO14E1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted2 x EC6H - Reversible Group Fan Electronic Controller1 x CONTROL ECOWATT - Basic2 x Envirovent G4 Filter - SL-G4/F71 x EC-Vent control board1 x EM30-24 Electro-Mechanical Control Panel3 x Elta 6 Amp Electronic single phase speed controller with TK2 x Skyflow SSR Horizontal Roof Cowl SSR31/35B2 x TG-K3/NTC10-01 - Duct temperature sensor3 x Transformer 5 Speed Controller - ATC1-12TK2 x Helios HQW-630/4 - IP552 x Electronic extractor fan speed controller - FSC 1.52 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE2 x Systemair Save Connect 2.0 Internet Module2 x Vent Axia T-Series Controller3 x Transformer (silent) speed controller - RE 3.0 Amp1 x Elta ACO Panel 149-ACO18B1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven3 x Transformer Speed Control - RTRE- 12.0Amp3 x Helios HQW-200/4 - IP552 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS1 x Helios TSW 7.5 Amp Transformer speed controller1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x EC-Vent Room Unit1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x Two Speed Switch - REGUL-22 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x EM30-24 Control Panel Commissioning Service2 x Airvent ceiling fan controller1 x Remote Timer Control - 13512 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Multiflow SMB550/4-1AC1 x Transformer (silent) speed controller - RE 1.5 Amp2 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x RDS 7 Helios Transformer Controller With Motor Protection3 x Vent Axia Silent 100T (TIMER)3 x Elta Variable Speed Drive IP66 - 0.75KW1 x TG-R room temperature sensor1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Speed Controller - REB52 x Helios PU10 Speed Potentiometer (Flush Mounted)2 x SG-200 Fan Guard for the HQW 2001 x Single phase speed controller by auto-transformer - RMB 10.0 Amp2 x Speed Controller - REB101 x Transformer (silent) speed controller - RE 5.0 Amp1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x DEF-140T Inlet Guard for the CBT-100N1 x CBS-60 Outlet Flange for CSB/CBT-601 x CBA-60 Inlet Flange for CBT-601 x Easy-fix termination kit - High Rise Ventilator - EFT2 x CBM 9-9 550w 4P VR (Open Motor)1 x Quietflow SQS100-1ECL - Centrifugal Box Fan2 x DDMP 10-08 3F 2210W M6A4 DG01 x Isolator Switch - EFF-ISO2 x Silent 100 Window Kit - windowS1 x Quietflow SQS400-1ECL - Centrifugal Box Fan1 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x Elta 6 Amp Electronic single phase speed controller.1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR2 x PIR Sensor - PIR22 x Elta Variable Speed Drive IP66 - 2.2KW2 x Helios HQW-250/4 - IP551 x Transformer Speed Control - RTRE- 7.0Amp1 x Elta Wall Cowl SWC56/631 x CMT-2 120/50 - 0,09Kw - LG270 Single inlet centrifugal fan direct driven2 x REB-CVF 0-10v Controller2 x UB47- Universal Insulated Terminal1 x CBT-100N Centrifugal1 x Elta - Room Sensor - Temp/Humid/C021 x GRA-100 External Grill by S&P1 x RDH FLEX-SQUARE - ADH/RDH 04501 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x MV-B Dual Switch for use with Helios HQW plate fans,1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR1 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt 3V (3-Speed)1 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt C VR1 x CBA-100 Inlet Flange for CBT-1001 x Elta Louvre Shutter - 400mm1 x Helios HQW-315/4 - IP553 x Speed Controller - REB1-N1 x CMT-2 180/75 0.75KW - Single inlet centrifugal fan with inlet and outlet flange connections - 200mm1 x VTR 300 STD Filter Kit1 x Contactor Interface Station - CI91 x SD-MUB Vibration pad set1 x CBM Low Pressure Centrifugal Fan - CBM 7/7 6 Pole 72watt CVR1 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x QPTW 250C Acoustic Twin Fan with Controller1 x Speed Controller - REB11 x RDS 11 Helios Transformer Controller With Motor Protection1 x Vent Axia ACM 200 inline mixed flow duct fan1 x Elta 10 Amp Electronic single phase speed controller.2 x MTP 10, 10K, Speed control1 x MTS10- extractor fan 3 step switch1 x DDMP 12-12 3F 1810W M6A4 DG01 x Compact SCD450/4-1AC1 x Transformer Speed Control - RTRE- 1.5Amp1 x EBM-Papst D4E225-BC01-17 Double inlet1 x Biflow SB400-CON2-3 - High Temperature Bifurcated Fan1 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan1 x Three Phase 3 step - 10amp Transformer controller for use with the HV Wall Mounted fans.
Reviews
Transformer (silent) speed controller - RE 1.5 Amp
Transformer (silent) speed controller - RE 1.5 Amp
£ 132.29

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