• 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

1 x SSR35SCP - Fan and Cowl Kit + Controller1 x 125mm Thermal Duct to Fitting Connector - SST-125-DFCON1 x Male Ducting Connector - 710mm1 x FAST-TRACK RANGE 90mm - Seal Ring (1 bag of 10)1 x Transformer (silent) speed controller - RE 3.0 Amp2 x Electronic extractor fan speed controller - FSC 1.51 x Elta Variable Speed Drive IP66 - 2.2KW1 x Elta Variable Speed Drive IP66 - 7.5KW1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x FU 15 40 Frequency Inverter1 x FU 075 52 Frequency Inverter (IP20)1 x FRQ5-4A V2 Inverter Speed Controller1 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 22 25 Frequency Inverter1 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 4.0KW1 x Frequency converter FU 075 14 - IP661 x FRQ5-10A Inverter Speed controller1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x Elta 10 Amp Electronic single phase speed controller.1 x ELTA - Three Phase Transformer 10amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x ELTA - Three Phase Transformer 3amps1 x FU 22 04 Frequency Inverter1 x Frequency converter RUCK - FU 075 211 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)1 x ELTA - Single Phase Transformer 2amps1 x NKS-D swirl diffuser v-300 x 300mm1 x Circular Ceiling Diffuser - TST 1251 x Balance S Diffuser - NO RING - 125mm2 x EC6H - Reversible Group Fan Electronic Controller1 x PCA Diffuser - PCA-3151 x Circular Ceiling Diffuser - TST 1001 x Circular Ceiling Diffuser - TST 2001 x Curved Blade Grille 600x600 (2way blow)1 x Elta 2 Amp Electronic single phase speed controller.1 x 5-Speed Controller for use with Elta SAX Classic Fans1 x ELTA - Single Phase Transformer 8amps1 x ELTA - Single Phase Transformer 16amps1 x Elta 3 Amp Electronic single phase speed controller.1 x Circular Ceiling Diffuser - TST 1601 x Airvent ceiling fan controller3 x Elta 6 Amp Electronic single phase speed controller with TK1 x EFSC-3N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 12amps1 x Balance S Diffuser - NO RING - 100mm3 x COM-31 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps1 x Round ceiling diffuser 200mm1 x EFSC-6N- Single Phase Speed Control1 x Round ceiling diffuser 300mm1 x Elta 6 Amp Electronic single phase speed controller.1 x Round ceiling diffuser 250mm1 x PCA Diffuser - PCA-2501 x Round ceiling diffuser 350mm1 x ELTA - Single Phase Transformer 10amps2 x TG-K Duct temperature sensor3 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Remote controller FLEX - for VEKO INT2 x Helios TSW 7.5 Amp Transformer speed controller3 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Helios TSW 3 Amp Transformer speed controller1 x RTRD - Three Phase Speed Controller - 2 Amp1 x Helios TSW MCB Amp Transformer speed controller2 x Three Phase Transformer controllers - RMT 1.5 Amp2 x Vent Axia ACM 100 inline mixed flow duct fan2 x Helios TSW 1.5 Amp Transformer speed controller1 x MV-B Dual Switch for use with Helios HQW plate fans,2 x Transformer 5 Speed Controller - ATC1-8TK2 x Transformer 5 Speed Controller - ATC1-10TK1 x Transformer 5 Speed Controller - ATC1-4TK1 x DEF-140T Inlet Guard for the CBT-100N1 x Vent Axia ACM 150 inline mixed flow duct fan2 x Vent Axia ACM 125 inline mixed flow duct fan1 x CS2 Current Switch2 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x MWS 3 – Transformer Controller With Motor Protection2 x Isolator Switch - ISOSW1 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x Single phase speed controller by auto-transformer - RMB 8.0 Amp1 x Systemair Save Connect 2.0 Internet Module2 x Elta 3 Amp Electronic single phase speed controller with TK1 x TTC-2000 Three phase electric heater controller1 x RDS 11 Helios Transformer Controller With Motor Protection1 x FAST-TRACK RANGE 90mm - Adaptor For Distribution Box1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x BEAS-control module1 x Helios HQW-200/2 - IP551 x MWS 1.5 – Transformer Controller With Motor Protection1 x ERR 20/1 Centrifugal inline fan1 x WS - Reversing Switch from Helios Fans1 x Elta ACO Panel 149-ACO14E1 x Envirovent G4 Filter - SL-G4/F71 x CONTROL ECOWATT - Basic1 x EC-Vent control board1 x CPTA-S PIR SENSOR Volt Free Contacts - Surface Mounted1 x Two Speed Switch - REGUL-21 x CBS-60 Outlet Flange for CSB/CBT-601 x Helios TSW 10 Amp Transformer speed controller1 x Transformer 5 Speed Controller - ATC1-12TK1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT
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