• 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 Elta Variable Speed Drive IP66 - 7.5KW1 x FU 22 25 Frequency Inverter1 x FU 15 40 Frequency Inverter1 x FRQ5-4A V2 Inverter Speed Controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x FRQ-10A V2 Inverter Speed controller4 x Elta Variable Speed Drive IP66 - 2.2KW2 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta 10 Amp Electronic single phase speed controller.4 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter RUCK - FU 075 201 x Frequency converter FU 075 14 - IP661 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 075 52 Frequency Inverter (IP20)1 x Circular Ceiling Diffuser - TST 1251 x FU 22 04 Frequency Inverter1 x Circular Ceiling Diffuser - TST 2001 x Balance S Diffuser - NO RING - 125mm1 x Round ceiling diffuser 300mm1 x EFSC-3N- Single Phase Speed Control1 x Round ceiling diffuser 350mm1 x ELTA - Single Phase Transformer 8amps1 x Airvent ceiling fan controller2 x Push Timer Switch - ZA42 x Helios ZNE Electronic Fan Overrun Timer2 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Time Delay Unit - DT20B2 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER2 x Round ceiling diffuser 400mm2 x Elta 3 Amp Electronic single phase speed controller with TK1 x EFSC-6N- Single Phase Speed Control2 x Remote Timer Control - 13512 x Run On Timer - 5s - 4hrs - RT5A3 x ACO8AC/EC AutoChangeover panel3 x ACOAS/ AC/EC Auto Changeover 8Amp1 x MTV-1/010 Controller 0 to 10V+1 x EC-Vent control board1 x Elta ACO Panel 149-ACO14E1 x CONTROL ECOWATT - Basic1 x ACO 149-ACO1/EDV1 x EM30-24 Electro-Mechanical Control Panel1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x EC-Vent Room Unit1 x Easy-fix termination kit - High Rise Ventilator - EFT1 x Elta ACO Panel 149-ACO18B3 x Systemair Save Connect 2.0 Internet Module1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x EM30-24 Control Panel Commissioning Service1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3552 x REB-CVF 0-10v Controller1 x Elta Wall Cowl SWC56/631 x Transformer 5 Speed Controller - ATC1-12TK1 x Three Phase Transformer controllers - RMT 1.5 Amp1 x Vent Axia ACM 125 inline mixed flow duct fan2 x DEF-140T Inlet Guard for the CBT-100N1 x Isolator Switch - ISOSW2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)3 x Electronic extractor fan speed controller - FSC 1.51 x Vent Axia T-Series Controller1 x Transformer (silent) speed controller - RE 3.0 Amp4 x Transformer Speed Control - RTRE- 1.5Amp1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Quietflow SQS400-1ECL - Centrifugal Box Fan3 x MTS10- extractor fan 3 step switch1 x Multiflow SMB550/4-1AC4 x MTP 10, 10K, Speed control1 x Elta Wall Cowl SWC35/401 x QPTW 250C Acoustic Twin Fan with Controller1 x Contactor Interface Station - CI91 x Elta Wall Cowl SWC45/502 x GRA-100 External Grill by S&P3 x Helios TSW 3 Amp Transformer speed controller2 x RDS 11 Helios Transformer Controller With Motor Protection1 x COM-31 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x TG-K Duct temperature sensor1 x MWS 1.5 – Transformer Controller With Motor Protection1 x BEAS-control module2 x Speed Controller - REB13 x CBT-100N Centrifugal1 x PIR Sensor - PIR41 x Elta Wall Cowl SWC25/311 x Elta Louvre Shutter - 400mm1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7103 x UB47- Universal Insulated Terminal3 x CBS-60 Outlet Flange for CSB/CBT-603 x Transformer Speed Control - RTRE- 7.0Amp3 x Vent Axia Silent 100T (TIMER)2 x SAVE VSR 300 heat recovery unit1 x Silentub - STUB 1001 x Jet Cowl - 315mm1 x AIRVENT speed control - AIR4019612 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Vent Axia ACM 200 inline mixed flow duct fan2 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven2 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT2 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)2 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR2 x DDMP 12-12 3F 1810W M6A4 DG02 x TD160-NT Mixvent - 100mm - TD160 Timer1 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3004 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Speed controller with Reverse - REB-1R1 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE2 x Single phase speed controller by auto-transformer - RMB 1.5 Amp2 x Commercial Single or 3 phase Fan Reversing Switch - RS13 x CBA-60 Inlet Flange for CBT-603 x TD Mixvent 800/200 EEXEIIT31 x ERR 20/1 Centrifugal inline fan3 x Speed Controller - REB2.5-N2 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x Mini Diffuser - 100mm2 x Transformer 5 Speed Controller - ATC1-2TK3 x Speed Controller - REB52 x DA9/9-NT1 x Egg Crate Grille with Dust panel filter 1 inch- 595x5952 x Helios RR-250-C Centrifugal inline fan1 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-4TK2 x Single phase speed controller by auto-transformer - RMB 10.0 Amp3 x Two Speed Switch - REGUL-21 x ERR 31/1 Centrifugal inline fan1 x ELM 18 EX Flexible Cuff for ERM 183 x Transformer (silent) speed controller - RE 1.5 Amp2 x Speed Controller - REB102 x CBM 9-9 550w 4P VR (Open Motor)2 x Speed Controller - REB84 x Silent 100 Window Kit - windowS2 x Elta 2 Amp Electronic single phase speed controller.1 x FFR 355 Filter Cassette1 x Compact SCD450/4-1AC1 x EBM-Papst D3G133-BF05-14 Double inlet1 x Quietflow SQS100-1ECL - Centrifugal Box Fan3 x Speed Controller - REB162 x CBM Low Pressure Centrifugal Fan - CBM 9/7 4 Pole 373watt CVR1 x HIMF - Mixed Flow Fan 100mm Inline Fan2 x CBT-130N Centrifugal ATEX II 3D ExtD 125*C3 x TD EVO-100 PF ECOWATT - Environmentally Friendly Energy Efficient Inline Fan2 x Skyflow SSR Horizontal Roof Cowl SSR31/35B2 x Skyflow SSR Horizontal Roof Cowl SSR80B3 x DDMP 09-09 3F 2130W M6A4 DG03 x DDMP 10-08 3F 2210W M6A4 DG02 x Electrostatic Precipitator - 1H x 3W1 x LFBR 315 G4 - Helios Inline Filter Box - 315mm1 x Single Deflection Grille 400mm with OBD damper3 x VTR 500 STD Filter Kit1 x Round ceiling diffuser 200mm1 x Transformer 5 Speed Controller - ATC1-8TK2 x Helios TSW 1.5 Amp Transformer speed controller3 x DEF-CBM-RE-7 - Protection Guard2 x Transformer Speed Control - RTRE- 5.0Amp2 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR2 x FRQ5-10A Inverter Speed controller1 x GENIOX 11 Internal Mounted Unit1 x Singleflow SSDL315-1EC3 x Biflow SB400-CON2-3 - High Temperature Bifurcated Fan2 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt 3V (3-Speed)2 x CBT-80N Centrifugal2 x CBP-18/18-RC Belt Driven Centrifugal Fans1 x CO2 Room Sensor - CO2-R2 x Vertical Cowl and Fan (Single Phase) - RAV400-4-11 x MWS 3 – Transformer Controller With Motor Protection1 x Speed Controller - REB1-N3 x DDMP 09/09 Mounting Flange2 x GXC6EC - High Performance Extract Fan1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.2 x VEKA INT 2000/15.0-L1 EKO2 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt C VR2 x CS2 Current Switch1 x Speed Controller - REB62 x Potentiometer EGH 01 - for DDMP Fans1 x CPTA-E Flush mounted PIR sensor with timer1 x Remote controller FLEX - for VEKO INT1 x Helios TSW 7.5 Amp Transformer speed controller2 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x Speed Controller - REB33 x KMBI 315 Connector rectangular/circular to install on the discharge of CMT2 x Helios HQW-630/4 - IP553 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven2 x TG-K3/NTC10-01 - Duct temperature sensor1 x Transformer (silent) speed controller - RE 5.0 Amp3 x KMBI 250 Connector rectangular/circular to install on the discharge of CMT2 x KBA- Inlet Mounting 3553 x CMT/4-315/130-4KW - Single inlet centrifugal fan direct driven1 x Elta 6 Amp Electronic single phase speed controller.2 x KBA- Inlet Mounting 2802 x KAD-355-F400 Rectangle Flexible Connector1 x TUNE-R-315-3-M4 - Control Damper3 x RD35S-4DW.6W.3L - 122297 (Three Phase)3 x CMT/4-250-100 1.1KW - Single inlet centrifugal fan direct driven ( LG-90)1 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x Non Vision 150mm x 150mm (Air Transfer) Grille - With Flange - MILL FINISH2 x CSB-60 Centrifugal fan2 x GENIOX 11 Roof Mounted External Unit1 x IR24-P - Presence detector1 x CCpro 40 (1CC9402) Long Casing Extension2 x Round ceiling diffuser 250mm1 x Comefri - TLZ 560 R - High Performance Scroll Fan1 x Duct Termination with Mesh - 355mm1 x SD-MUB Vibration pad set3 x CMT-2 120/50 - 0,09Kw - LG270 Single inlet centrifugal fan direct driven1 x Lo-Carbon Silhouette 100T (Timer)2 x Helios TSW MCB Amp Transformer speed controller1 x RDS 7 Helios Transformer Controller With Motor Protection1 x Elta 3 Amp Electronic single phase speed controller.1 x VTR 300 STD Filter Kit1 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)2 x CMT/4-280-115 2.2KW - Single inlet centrifugal fan direct driven ( LG-90)1 x KBA- inlet mounting flange for CRMT 2501 x 220x90mm Insulated Rectangular Vertical 45° Bend1 x CBA-100 Inlet Flange for CBT-1001 x 220x90mm Insulated Rectangular Vertical 90° Bend1 x Comefri - TLZ 225 R - High Performance Scroll Fan1 x KBA- Inlet Mounting 2251 x Vent Axia Trickle & Boost Switch1 x CK-60F Kit1 x AXC TP - 100mm Plastic Centrifugal Inline Fan1 x Vent Axia ACM 100 inline mixed flow duct fan1 x VKS 355-500 Automatic shutter1 x KBA- Inlet Mounting 3151 x Duct Termination with Mesh - 710mm1 x CMT-2 180/75 0.75KW - Single inlet centrifugal fan with inlet and outlet flange connections - 200mm2 x 110 x 54mm Round to Rectangular Adaptor - Long1 x Envirovent 4 Way Remote Control Switch - SWHBKRF-41 x TDP-D Pressure Sensor with Display1 x MWS-75 Transformer controller with TK -7.5A1 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)1 x RSK355 - Back Draught Shutter1 x 204x60mm Insulated Rectangular Vertical 45° Bend1 x 204x60mm Insulated Rectangular Vertical 90° Bend1 x CBM 7/7 147w 4P RE-VR1 x Comefri - TLZ 450 R - High Performance Scroll Fan2 x Helios ESA-1 Surface mounted Speed Control 1amp1 x KBA- Inlet Mounting 1802 x CBM 12-12 1100w 6P Three Phase1 x CFI In-line 150 - Carbon Filter1 x Twinflow STDL315-1EC1 x Envirovent G4 Filter - SL-G4/F71 x KBA- inlet mounting flange for CRMT 2251 x 220x90mm Insulated Rectangular Horizontal 90° Bend1 x 220x90mm Insulated Rectangular Horizontal 45° Bend1 x MWS 5 – Transformer Controller With Motor Protection Unit
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Reviews
DAOSL Back Draft Damper
DAOSL Back Draft Damper
£ 11.49

Look good, works well, except the shaft of the lanellae cuts...