• 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 - 7.5KW3 x Elta Variable Speed Drive IP66 - 2.2KW3 x FRQ5-4A V2 Inverter Speed Controller1 x FU 15 40 Frequency Inverter1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 3.0 Transformer Speed Control (400v)3 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 075 52 Frequency Inverter (IP20)1 x FU 22 25 Frequency Inverter1 x FU 15 16 Frequency Inverter1 x Frequency converter RUCK - FU 075 203 x Elta Variable Speed Drive IP66 - 4.0KW1 x ELTA - Three Phase Transformer 3amps1 x ELTA - Three Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)2 x FRQ5-10A Inverter Speed controller1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x NKS-D swirl diffuser v-300 x 300mm1 x FU 075 04 Frequency Inverter (IP20)1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x Circular Ceiling Diffuser - TST 1251 x PCA Diffuser - PCA-3151 x Circular Ceiling Diffuser - TST 2001 x Circular Ceiling Diffuser - TST 1001 x Balance S Diffuser - NO RING - 125mm1 x Curved Blade Grille 600x600 (2way blow)2 x Round ceiling diffuser 400mm1 x JSR 200 Painted RAL50181 x Circular Ceiling Diffuser - TST 1601 x Balance S Diffuser - NO RING - 100mm1 x Round ceiling diffuser 300mm3 x Round ceiling diffuser 200mm1 x Round ceiling diffuser 350mm3 x Round ceiling diffuser 250mm1 x PCA Diffuser - PCA-2501 x Time Delay Unit - DT20B3 x Multi Input Run On Timer - 0 - 20min - CFCU3 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller1 x ACOAS/ AC/EC Auto Changeover 8Amp3 x ACO8AC/EC AutoChangeover panel1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 x CONTROL ECOWATT - Basic1 x EM30-24 Electro-Mechanical Control Panel1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Easy-fix termination kit - High Rise Ventilator - EFT1 x EC-Vent Room Unit1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x Elta ACO Panel 149-ACO18B3 x Systemair Save Connect 2.0 Internet Module1 x EM30-24 Control Panel Commissioning Service1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x GRA-100 External Grill by S&P1 x Elta Wall Cowl SWC35/401 x Elta Louvre Shutter - 400mm3 x UB47- Universal Insulated Terminal1 x Elta Wall Cowl SWC25/311 x Elta Wall Cowl SWC45/501 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7103 x Push Timer Switch - ZA42 x Vent Axia ACM 150 inline mixed flow duct fan2 x Three Phase Transformer controllers - RMT 1.5 Amp3 x COM-33 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A6 x Vent Axia ACM 125 inline mixed flow duct fan2 x Isolator Switch - ISOSW2 x Helios ZNE Electronic Fan Overrun Timer2 x BEAS-control module2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)3 x MWS 1.5 – Transformer Controller With Motor Protection6 x Transformer (silent) speed controller - RE 3.0 Amp3 x Speed Controller - REB52 x Electronic extractor fan speed controller - FSC 1.52 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted4 x Speed Controller - REB1-N1 x Multiflow SMB550/4-1AC2 x Quietflow SQS400-1ECL - 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RTRE- 7.0Amp3 x MTP 10, 10K, Speed control1 x Elta Wall Cowl SWC56/632 x Silent 100 Window Kit - windowS2 x Speed Controller - REB81 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)2 x VTR 300 STD Filter Kit2 x DDMP 12-12 3F 1810W M6A4 DG02 x TG-K Duct temperature sensor1 x CBT-100N Centrifugal1 x Compact SCD450/4-1AC2 x Elta Variable Speed Drive IP66 - 1.5KW2 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Silentub - STUB 1001 x Egg Crate Grille with Dust panel filter 1 inch- 595x5951 x Single Deflection Grille 400mm with OBD damper2 x CO2 Room Sensor - CO2-R5 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan3 x Remote controller FLEX - for VEKO INT4 x Helios TSW 7.5 Amp Transformer speed controller1 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans3 x EC6H - Reversible Group Fan Electronic Controller2 x RTRD - Three Phase Speed Controller - 2 Amp2 x DEF-140T Inlet Guard for the CBT-100N2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x Single phase speed controller by auto-transformer - RMB 1.5 Amp3 x Two Speed Switch - REGUL-22 x TD EVO-100 PF ECOWATT - Environmentally Friendly Energy Efficient Inline Fan1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven3 x Elta 6 Amp Electronic single phase speed controller with TK2 x Envirovent G4 Filter - SL-G4/F72 x Vent Axia T-Series Controller4 x WS - Reversing Switch from Helios Fans1 x Airvent ceiling fan controller1 x Helios HQW-200/4 - IP552 x CBS-60 Outlet Flange for CSB/CBT-602 x TG-R room temperature sensor2 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT2 x Transformer (silent) speed controller - RE 1.5 Amp2 x TG-K3/NTC10-01 - Duct temperature sensor3 x Speed Controller - REB102 x Transformer Speed Control - RTRE- 5.0Amp1 x CBM 9-9 550w 4P VR (Open Motor)3 x CBA-60 Inlet Flange for CBT-601 x Speed Controller - REB162 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR2 x VEKA INT 2000/15.0-L1 EKO2 x AXC TP - 100mm Plastic Centrifugal Inline Fan1 x TD160-NT Mixvent - 100mm - TD160 Timer1 x CSB-60 Centrifugal fan1 x Singleflow SSDL315-1EC2 x TUNE-R-250-3-M0 - Control Damper (NO ACTUATOR)1 x HIMF - Mixed Flow Fan 100mm Inline Fan1 x CBA-100 Inlet Flange for CBT-1001 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x CBM Low Pressure Centrifugal Fan - CBM 9/7 4 Pole 373watt CVR1 x IR24-P - Presence detector1 x Helios ESA-1 Surface mounted Speed Control 1amp1 x CBT-80N Centrifugal2 x CPTA-E Flush mounted PIR sensor with timer2 x Transformer 5 Speed Controller - ATC1-2TK1 x Speed controller with Reverse - REB-1R1 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-8TK1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost3 x Helios TSW 3 Amp Transformer speed controller3 x MWS 3 – Transformer Controller With Motor Protection3 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x REE-1 Electronic Speed Controller1 x Helios HQW-630/4 - IP552 x Transformer Speed Control - RTRE- 12.0Amp1 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)1 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS2 x REB-CVF 0-10v Controller1 x SG-200 Fan Guard for the HQW 2001 x Contactor Interface Station - CI91 x GENIOX 11 Internal Mounted Unit3 x DEF-CBM-RE-7 - Protection Guard1 x Quietflow SQS100-1ECL - Centrifugal Box Fan1 x Elta Variable Speed Drive IP66 - 5.5KW1 x CBM 12-12 1100w 6P Three Phase1 x Helios RR-250-C Centrifugal inline fan1 x CBP-18/18-RC Belt Driven Centrifugal Fans2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-43 x Temperature Fan Speed Controller - ATCP4-WMS1 x Helios TSW 0.3Amp Compact Transformer speed controller1 x MWS 5 – Transformer Controller With Motor Protection Unit1 x Helios TSW MCB Amp Transformer speed controller1 x RTRD - Three Phase Speed Controller - 4 Amp1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT2 x TEM 075 - 5 Speed Transformer Speed Control1 x ERR 20/1 Centrifugal inline fan1 x Helios HQW-200/2 - IP551 x Vortice Quadro Micro 100 I - Standard Version1 x KMBI 315 Connector rectangular/circular to install on the discharge of CMT1 x Speed Controller - REB62 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x TUNE-R-200-3-M1 - Control Damper2 x KMBI 250 Connector rectangular/circular to install on the discharge of CMT3 x Helios HQW-315/4 - IP552 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven1 x FFR 355 Filter Cassette3 x Transformer Speed Control - RTRE- 1.5Amp1 x DDMP 09-09 3F 2130W M6A4 DG01 x Vent Axia Silent 100T (TIMER)1 x TD Mixvent 800/200 EEXEIIT31 x Helios HQW-250/4 - IP551 x MEV Spider Wireless boost Switch - MEV-SWH-W1 x Speed Controller - REB2.5-N1 x ENV 100 12v transformer SELV1 x Electrostatic Precipitator - 1H x 3W1 x TUNE-R-200-3-M2 - Control Damper
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Really well made but comes with no speed controler? ?and can...