• 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 CBM Low Pressure Centrifugal Fan - CBM 12/9 6 Pole 736watt C1 x Helios TSD 5.5 Transformer Speed Control (400v)1 x FU 15 40 Frequency Inverter1 x FRQ5-4A V2 Inverter Speed Controller1 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP663 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 075 52 Frequency Inverter (IP20)1 x FU 22 25 Frequency Inverter1 x ELTA - Three Phase Transformer 3amps1 x ELTA - Three Phase Transformer 10amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x FRQ5-10A Inverter Speed controller2 x Elta 10 Amp Electronic single phase speed controller.1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Frequency converter RUCK - FU 075 201 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x ELTA - Single Phase Transformer 2amps2 x Electronic extractor fan speed controller - FSC 1.51 x EC6H - Reversible Group Fan Electronic Controller1 x Elta 2 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 8amps1 x ELTA - Single Phase Transformer 16amps1 x EFSC-3N- Single Phase Speed Control1 x Elta 3 Amp Electronic single phase speed controller with TK1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 4amps1 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 12amps4 x COM-31 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x EFSC-6N- Single Phase Speed Control1 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)1 x Elta 6 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)3 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A2 x Transformer 5 Speed Controller - ATC1-8TK1 x Helios ZNE Electronic Fan Overrun Timer3 x Push Timer Switch - ZA46 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x Time Delay Unit - DT20B3 x Multi Input Run On Timer - 0 - 20min - CFCU2 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x ACO8AC/EC AutoChangeover panel1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 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 EC-Vent Room Unit1 x Elta ACO Panel 149-ACO18B5 x Systemair Save Connect 2.0 Internet Module1 x EM30-24 Control Panel Commissioning Service1 x Transformer Speed Control - RTRE- 1.5Amp1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x CBT-100N Centrifugal1 x DEF-CBM-RE-7 - Protection Guard5 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan7 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Elta Variable Speed Drive IP66 - 7.5KW2 x Elta Variable Speed Drive IP66 - 2.2KW1 x FRQ-10A V2 Inverter Speed controller3 x Remote controller FLEX - for VEKO INT3 x Transformer 5 Speed Controller - ATC1-2TK3 x Helios TSW 7.5 Amp Transformer speed controller3 x Transformer 5 Speed Controller - ATC1-10TK3 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x Transformer 5 Speed Controller - ATC1-4TK3 x Helios TSW 3 Amp Transformer speed controller3 x Vent Axia ACM 150 inline mixed flow duct fan1 x RDS 11 Helios Transformer Controller With Motor Protection3 x Three Phase Transformer controllers - RMT 1.5 Amp1 x Three Phase 3 step - 10amp Transformer controller for use with the HV Wall Mounted fans.3 x Vent Axia ACM 200 inline mixed flow duct fan3 x Vent Axia ACM 100 inline mixed flow duct fan2 x CS2 Current Switch2 x DEF-140T Inlet Guard for the CBT-100N4 x Isolator Switch - ISOSW2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x TG-K Duct temperature sensor1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven3 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)4 x WS - Reversing Switch from Helios Fans4 x MWS 1.5 – Transformer Controller With Motor Protection2 x Envirovent G4 Filter - SL-G4/F73 x Vent Axia T-Series Controller5 x Transformer (silent) speed controller - RE 3.0 Amp1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x CBS-60 Outlet Flange for CSB/CBT-601 x Speed Controller - REB32 x Transformer (silent) speed controller - RE 1.5 Amp1 x Speed Controller - REB55 x Commercial Single or 3 phase Fan Reversing Switch - RS12 x FAST-TRACK RANGE 75mm - Click Ring (1 bag of 10)2 x Transformer Speed Control - RTRE- 7.0Amp1 x Quietflow SQS400-1ECL - Centrifugal Box Fan3 x Speed Controller - REB1-N2 x REB-CVF 0-10v Controller1 x CBM 9-9 550w 4P VR (Open Motor)2 x REE-2 Electronic Speed Controller1 x CBA-60 Inlet Flange for CBT-601 x MTP 10, 10K, Speed control1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x MTS10- extractor fan 3 step switch2 x RDH FLEX-SQUARE - ADH/RDH 04501 x MEV Spider Wireless boost Switch - MEV-SWH-W1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x PIR Sensor - PIR21 x Vent Axia Silent 100T (TIMER)1 x Speed Controller - REB11 x TD Mixvent 800/200 EEXEIIT31 x Silent 100 Window Kit - windowS1 x PIR Sensor - PIR41 x Speed Controller - REB81 x DDMP 09/09 Mounting Flange1 x UB47- Universal Insulated Terminal1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost5 x Vent Axia ACM 125 inline mixed flow duct fan1 x ERR 20/1 Centrifugal inline fan1 x Transformer Speed Control - RTRE- 5.0Amp1 x MTV-1/010 Controller 0 to 10V+3 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Helios TSW 1.5 Amp Transformer speed controller3 x MWS 3 – Transformer Controller With Motor Protection2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-43 x Helios TSW MCB Amp Transformer speed controller5 x RRB- transformer controller3 x Single phase speed controller by auto-transformer - RMB 8.0 Amp2 x Temperature Fan Speed Controller - ATCP4-WMS1 x FAST-TRACK RANGE 90mm - Adaptor For Distribution Box2 x Two Speed Switch - REGUL-23 x Elta 6 Amp Electronic single phase speed controller with TK1 x BEAS-control module2 x Transformer speed controller - ATC1 - 1.5 Amps4 x MV-B Dual Switch for use with Helios HQW plate fans,1 x TEM 075 - 5 Speed Transformer Speed Control1 x Speed controller with Reverse - REB-1R1 x Transformer 5 Speed Controller - ATC1-12TK1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x Insulated extract Plenum 8+11 x Insulated extract Plenum 6+11 x Helios HQW-200/2 - IP551 x RDS 7 Helios Transformer Controller With Motor Protection3 x Helios HQW-630/4 - IP551 x Transformer Speed Control - RTRE- 12.0Amp2 x REE-1 Electronic Speed Controller4 x TG-K3/NTC10-01 - Duct temperature sensor4 x Helios HQW-200/4 - IP551 x Airvent ceiling fan controller1 x FAST-TRACK RANGE 90mm - Click Ring (1 bag of 10)1 x ELM 18 EX Flexible Cuff for ERM 182 x Vortice Quadro Micro 100 I - Standard Version2 x TG-R room temperature sensor1 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted2 x Isolator Switch - EFF-ISO1 x KMBI 250 Connector rectangular/circular to install on the discharge of CMT2 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS1 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven1 x Skyflow SSR Horizontal Roof Cowl SSR80B2 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x Transformer (silent) speed controller - RE 5.0 Amp1 x DDMP 09-09 3F 2130W M6A4 DG01 x SG-200 Fan Guard for the HQW 2001 x TUNE-R-200-3-M1 - Control Damper2 x Helios HQW-315/4 - IP552 x Speed Controller - REB10
Reviews
TD-SILENT 350/125
TD-SILENT 350/125
£ 178.68

Excellent low noise fan, I've got one unit running years and...