• Model:SQS250-1ECL

Quietflow SQS250-1ECL - Centrifugal Box Fan

£ 1,259.39 (excl. VAT)

£ 1,511.27 (inc. VAT)


Quietflow SQS250-1ECL - Centrifugal Box Fan

• Standard size 250 mm
• Air volume flow rates up to 0.347 m3/s
• Static pressures up to 841 Pa
• Suitable for operating temperatures up to +60℃
• Robust galvanised sheet steel casing
Acoustically lined single in-line centrifugal fans, suitable for internal duct mounting. The Quietflow incorporates advanced backward curved impellers, with three ndimensional profiled blades.

Low Noise
Each unit is acoustically lined internally with Class O rated (BS 476 Parts 6 and 7) fire resistant acoustic foam lining minimising breakout noise levels.

Easy Installation
New multi-mount brackets allow easy mounting in a range of orientations.

Easy Commissioning
Integrated commissioning control allowing single speed selection and also limiting maximum speed if used with an external potentiometer.

Efficient Performance
High efficiency low tonal noise backward curved centrifugal impellers are directly driven by an EC external rotor motor, provide low specific fan powers and stepless speed control without tonal noise generation.

Weather Resistance
Units can be weatherproofed in the factory to allow external installation.

PDF Files


SQS250-1ECL Specification Sheets

2 x DEF-140T Inlet Guard for the CBT-100N1 x RDS 11 Helios Transformer Controller With Motor Protection2 x Elta 10 Amp Electronic single phase speed controller.1 x NKS-D swirl diffuser v-300 x 300mm1 x ELTA - Single Phase Transformer 2amps1 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)3 x EC6H - Reversible Group Fan Electronic Controller1 x Round ceiling diffuser 400mm1 x JSR 200 Painted RAL50181 x Elta 2 Amp Electronic single phase speed controller.1 x 5-Speed Controller for use with Elta SAX Classic Fans2 x Transformer 5 Speed Controller - ATC1-4TK1 x Circular Ceiling Diffuser - TST 1601 x Balance S Diffuser - NO RING - 100mm2 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 16amps3 x Elta 3 Amp Electronic single phase speed controller with TK3 x Airvent ceiling fan controller1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 12amps1 x Round ceiling diffuser 200mm1 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps1 x Round ceiling diffuser 300mm1 x Round ceiling diffuser 250mm1 x COM-31 x Round ceiling diffuser 350mm1 x EFSC-6N- Single Phase Speed Control1 x PCA Diffuser - PCA-2501 x Elta 6 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 10amps3 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A3 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B1 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 EM30-24 Electro-Mechanical Control Panel1 x ACO 149-ACO1/EDV1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection3 x Systemair Save Connect 2.0 Internet Module1 x EC-Vent Room Unit1 x Elta ACO Panel 149-ACO18B1 x EM30-24 Control Panel Commissioning Service2 x Multi Input Run On Timer - 0 - 20min - CFCU2 x Vent Axia ACM 150 inline mixed flow duct fan2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x Vent Axia T-Series Controller2 x Electronic extractor fan speed controller - FSC 1.52 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Speed Controller - REB51 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 S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x PIR Sensor - PIR22 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan4 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x Remote controller FLEX - for VEKO INT2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-8TK2 x Transformer 5 Speed Controller - ATC1-12TK2 x Vent Axia ACM 100 inline mixed flow duct fan3 x Vent Axia ACM 125 inline mixed flow duct fan2 x Helios TSW 3 Amp Transformer speed controller2 x CS2 Current Switch2 x Isolator Switch - ISOSW2 x TG-K Duct temperature sensor2 x BEAS-control module2 x MWS 3 – Transformer Controller With Motor Protection1 x Helios HQW-200/2 - IP552 x REE-1 Electronic Speed Controller2 x Helios HQW-630/4 - IP552 x TG-R room temperature sensor1 x Transformer (silent) speed controller - RE 5.0 Amp2 x Skyflow SSR Horizontal Roof Cowl SSR31/35BS1 x Helios HQW-315/4 - IP552 x Multiflow SMB550/4-1AC1 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)2 x WS - Reversing Switch from Helios Fans3 x Transformer (silent) speed controller - RE 3.0 Amp1 x Elta Variable Speed Drive IP66 - 2.2KW1 x QPTW 250C Acoustic Twin Fan with Controller1 x DEF-CBM-RE-7 - Protection Guard1 x Speed Controller - REB11 x VTR 300 STD Filter Kit2 x Helios TSW 7.5 Amp Transformer speed controller1 x Helios TSW 0.3Amp Compact Transformer speed controller1 x Helios TSW 1.5 Amp Transformer speed controller3 x Single phase speed controller by auto-transformer - RMB 1.5 Amp2 x Two Speed Switch - REGUL-22 x TG-K3/NTC10-01 - Duct temperature sensor2 x Single phase speed controller by auto-transformer - RMB 8.0 Amp1 x Transformer Speed Control - RTRE- 1.5Amp2 x Elta Variable Speed Drive IP66 - 0.75KW1 x Silent 100 Window Kit - windowS1 x Transformer Speed Control - RTRE- 12.0Amp1 x Elta Wall Cowl SWC56/631 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan2 x Temperature Fan Speed Controller - ATCP4-WMS1 x REU 1.5amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Transformer 5 Speed Controller - ATC1-2TK1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Vent Axia ACM 200 inline mixed flow duct fan1 x Transformer speed controller - ATC1 - 1.5 Amps1 x Helios TSW MCB Amp Transformer speed controller1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x Helios TSW 10 Amp Transformer speed controller2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x Helios HQW-200/4 - IP551 x Commercial Single or 3 phase Fan Reversing Switch - RS11 x Transformer Speed Control - RTRE- 7.0Amp1 x Helios PU10 Speed Potentiometer (Flush Mounted)2 x MWS 1.5 – Transformer Controller With Motor Protection1 x MTS10- extractor fan 3 step switch1 x Speed Controller - REB1-N1 x REB-CVF 0-10v Controller1 x TD ECOWATT 160/100 Inline Duct Fan - TD-ECOWATT1 x ELM 18 EX Flexible Cuff for ERM 181 x Skyflow SSR Horizontal Roof Cowl SSR31/35B1 x Speed Controller - REB101 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x TUNE-R-200-3-M1 - Control Damper1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x MV-B Dual Switch for use with Helios HQW plate fans,1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp
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