• 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 3 Amp Electronic single phase speed controller with TK4 x BEAS-control module4 x Helios HQW-200/2 - IP551 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Transformer (silent) speed controller - RE 1.5 Amp2 x Systemair Save Connect 2.0 Internet Module1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted2 x Speed Controller - REB104 x MWS 1.5 – Transformer Controller With Motor Protection1 x UB47- Universal Insulated Terminal2 x Helios HQW-200/4 - IP551 x Envirovent G4 Filter - SL-G4/F71 x Transformer Speed Control - RTRE- 7.0Amp3 x TG-K3/NTC10-01 - Duct temperature sensor1 x EC-Vent Room Unit1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x EM30-24 Control Panel Commissioning Service2 x Helios HQW-630/4 - IP552 x MTP 10, 10K, Speed control1 x EC6H - Reversible Group Fan Electronic Controller1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Speed Controller - REB1-N4 x WS - Reversing Switch from Helios Fans2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans4 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)3 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE1 x Vent Axia ACM 125 inline mixed flow duct fan1 x QPTW 250C Acoustic Twin Fan with Controller2 x RDH FLEX-SQUARE - ADH/RDH 04503 x Vent Axia Silent 100T (TIMER)1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection2 x PIR Sensor - PIR21 x PIR Sensor - PIR41 x Easy-fix termination kit - High Rise Ventilator - EFT3 x Transformer (silent) speed controller - RE 3.0 Amp1 x Elta 6 Amp Electronic single phase speed controller.2 x Airvent ceiling fan controller2 x Helios TSW 1.5 Amp Transformer speed controller1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x Multiflow SMB550/4-1AC1 x CBM Low Pressure Centrifugal Fan - CBM 9/7 4 Pole 373watt CVR2 x Quietflow SQS400-1ECL - Centrifugal Box Fan2 x CBT-100N Centrifugal2 x Commercial Single or 3 phase Fan Reversing Switch - RS13 x Elta Variable Speed Drive IP66 - 2.2KW2 x REE-1 Electronic Speed Controller2 x SG-200 Fan Guard for the HQW 2002 x Electronic extractor fan speed controller - FSC 1.52 x CBS-60 Outlet Flange for CSB/CBT-602 x CBA-60 Inlet Flange for CBT-602 x AXC TP - 150mm Plastic Centrifugal Inline Fan2 x Remote Timer Control - 13511 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x 7 Day Programmable TIMECLOCK1 x DDMP 10-08 3F 2210W M6A4 DG01 x Transformer Speed Control - RTRE- 1.5Amp2 x RD35S-4DW.6W.3L - 122297 (Three Phase)2 x DDMP 12-12 3F 5700W M6M0 DG71 x Flakt Woods ME 1.6 speed controller 6.0amp - EA9011591 x TUNE-R-200-3-M2 - Control Damper2 x Speed Controller - REB52 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x Elta HXP 800mm 6-Pole (Three Phase)2 x TG-R room temperature sensor2 x Helios ESA-1 Surface mounted Speed Control 1amp2 x Vent Axia T-Series Controller2 x RUCK MTP 20, 10K, Speed control2 x Duct Termination with Mesh - 250mm1 x CBA-100 Inlet Flange for CBT-1001 x DDMP 12-09 1F 1800W M6A4 DA81 x TD160-NT Mixvent - 100mm - TD160 Timer2 x Transformer Speed Control - RTRE- 12.0Amp1 x Elta Wall Cowl SWC56/631 x Silent 100 Window Kit - windowS2 x Isolator Switch - EFF-ISO1 x CBM 9-9 550w 4P VR (Open Motor)3 x REB-CVF 0-10v Controller1 x Biflow SB250-CON2-3 - High Temperature Bifurcated Fan1 x GRA-100 External Grill by S&P1 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt 3V (3-Speed)1 x TUNE-R-200-3-M4 - Control Damper1 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Vent Axia ACM 150 inline mixed flow duct fan1 x SD-MUB Vibration pad set1 x Run On Timer - 5s - 4hrs - RT5A1 x Helios HQW-315/4 - IP551 x CBT-80N Centrifugal1 x CAD-COMPACT 900 ADVANCED N8 - MVHR unit1 x Vent Axia ACM 200 inline mixed flow duct fan2 x CBB-60N Centrifugal1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 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 CMT1 x Speed controller with Reverse - REB-1R1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x Vent Axia ACM 100 inline mixed flow duct fan2 x Transformer (silent) speed controller - RE 5.0 Amp1 x KBA- inlet mounting flange for CRMT 2502 x Speed Controller - REB11 x CFI In-line 425 - Carbon Filter1 x Transformer 5 Speed Controller - ATC1-4TK1 x Biflow SB250-CON4-3 - High Temperature Bifurcated Fan1 x Duct Termination with Mesh - 710mm1 x TUNE-R-200-3-M0 - Control Damper (NO ACTUATOR)1 x Ducting 15 Degree Bend - 100mm1 x DPD 12PM Delivery Surcharge1 x Skyflow SSR Horizontal Roof Cowl SSR80B1 x Biflow SB400-CON2-3 - High Temperature Bifurcated Fan1 x RDS 11 Helios Transformer Controller With Motor Protection2 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Transformer 5 Speed Controller - ATC1-2TK1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x Elta Louvre Shutter - 400mm1 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan
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