SQI: Square Centrifugal Inline Blowers

  • SQI-D
  • SQI-B
  • Standard Construction Features
  • ISO 9001, US-Green, AMCA Sound & Air, CSA, US-C-UL, and Seismic Logos

Direct Drive

SQI-B

Belt Drive

SQI-Standard Construction Features

Construction Feature

ISO 9001, US-Green, AMCA Sound & Air, CSA, US-C-UL, and Seismic Logos

ISO 9001, US-Green, AMCA Sound & Air, CSA, US-C-UL, and Seismic Logos

UL Canada & United States Cert. logo

UL Certified in the US and Canada

UL Canada & United States Cert. logo

Revit available

Cook’s Square Centrifugal Inline fans provide maximum performance and durability in a rugged inline design. The SQI is suitable for a wide variety of commercial and industrial air moving applications. Applications include general ventilation, dishwasher exhaust, spark resistant ventilation and outdoor installations.

  • SQI units feature a compact, straight through airflow design.
  • Welded steel housing with integral inlet and outlet flanges.
  • Airflow straightening vanes that increase efficiency.
  • An inner drum and belt tunnel that completely encloses the drive components.
  • Construction Features include
    • Positive Belt Tension
    • Welded Housing
    • Inlet & Outlet Flange
Related Documents

See the Downloads tab for Specifications, Submittals, and FanDrafter files

See also SQN

  • SQI-D

  • SQI-B

  • SQI-HP

  • Options & Accessories

  • Installation

  • Downloads

SQI-D
Loren Cook Company certifies that the SQI-D shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and AMCA Publication 311 and comply with the requirements of the AMCA Certified Ratings Program.

Type SQI-D is furnished standard with UL 705 & cUL 705 listing (Power Ventilator/ZACT) when furnished with factory supplied motor.

SQI Direct Drive

Square Centrifugal
Inline Blower
Direct Drive
  • SQI is available in 7 direct drive sizes.
  • Impeller Size: 7 - 16.5 in
  • Flow: 63 - 4,906 CFM
  • SP: 0 - 2 in

Description: Fan shall be duct mounted, direct driven centrifugal square inline.

Certifications: Fan shall be manufactured at an ISO 9001 certified facility. Fan shall be listed by Underwriters Laboratories (UL 705) and UL listed for Canada (cUL 705). Fan shall bear the AMCA Certified Ratings Seal for Sound
and Air Performance.

Construction: The fan shall be of bolted and welded construction utilizing corrosion resistant fasteners. Housing shall be minimum 18 gauge steel with airflow straightening vanes and integral duct flanges. Hinged access door
shall be located in the specified position. Unit shall bear an engraved aluminum nameplate. Nameplate shall indicate design CFM and static pressure. Unit shall be shipped in ISTA Certified Transit Tested Packaging.

Coating: Steel fan components shall be Lorenized® with an electrostatically applied, baked polyester powder coating. Each component shall be subject to a five stage environmentally friendly wash system, followed by a minimum 2 mil thick baked powder finish. Paint must exceed 1,000 hour salt spray under ASTM B117 test method.

Wheel: Wheel shall be centrifugal backward inclined, constructed of 100 percent aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum
performance and efficiency. Wheel shall be balanced in accordance with AMCA Standard 204-96, Balance Quality and Vibration Levels for Fans.

Motor: Motor shall be heavy duty type with permanently lubricated sealed ball bearings and furnished at the specified voltage and phase.

Product: Fan shall be model SQI-D as manufactured by Loren Cook Company of Springfield, Missouri.

Dimensions (Inches) sqn-d dimension drawing
Fan Size A C Approximate
Shipping Weight
(pounds)
70 10-1/8 9-3/4 11-3/4 13-1/8 38
80 13 13 15-1/8 16 43
90 14-7/16 14-3/8 16-13/16 17-1/2 55
120 17-3/8 17-3/4 20-3/16 20-1/2 175
135 19-1/2 20-1/4 22-11/16 22-5/8 232
150 21-5/8 22-13/16 25-1/4 24-3/4 285
165 23-13/16 25-5/16 27-3/4 26-15/16 305
SQI-B
Loren Cook Company certifies that the SQI-B shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and AMCA Publication 311 and comply with the requirements of the AMCA Certified Ratings Program.

Type SQI-B is furnished standard with UL 705 & cUL 705 listing (Power Ventilator/ZACT) when furnished with factory supplied motor.

SQI Belt Drive

Square Centrifugal
Inline Blower
Belt Drive

  • SQI is available in 15 belt drive sizes.
  • Impeller Size: 10 - 36.5
  • Flow: 400 - 33,130 CFM
  • SP:0.125 - 3.5 in

Description: Fan shall be duct mounted, belt driven centrifugal square inline.

Certifications: Fan shall be manufactured at an ISO 9001 certified facility. Fan shall be listed by Underwriters Laboratories (UL 705) and UL listed for Canada (cUL 705). Fan shall bear the AMCA certified ratings seal for sound and air performance.

Construction: The fan shall be of bolted construction utilizing corrosion resistant fasteners. Housing shall be minimum 18 gauge galvanized steel with integral duct collars. Bolted access doors shall be provided on three sides, sealed with closed cell neoprene gasketing. Pivoting motor plate shall utilize threaded L-bolt design for positive belt tensioning. Housing shall be pre-drilled to accommodate universal mounting feet for vertical or horizontal installation. Unit shall bear an engraved aluminum nameplate. Nameplate shall indicate design CFM, static pressure, and maximum fan RPM. Unit shall be shipped in ISTA certified transit tested packaging.

Wheel: Wheel shall be centrifugal backward inclined, constructed of 100% aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum performance and efficiency. Wheel shall be balanced in accordance with AMCA Standard 204-05, Balance Quality and Vibration Levels for Fans.

Motor: Motor shall be NEMA design B with class B insulation rated for continuous duty and furnished at the specified voltage, phase and enclosure.

Bearings: Bearings shall be designed and individually tested specifically for use in air handling applications. Construction shall be heavy duty regreasable ball type in a pillow block cast iron housing selected for a minimumL50 life in excess of 200,000 hours at maximum cataloged operating speed.

Belts and Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150% of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM.

Product: Fan shall be model SQN-B as manufactured by Loren Cook Company of Springfield, Missouri

Dimensions (Inches) sqi-b dimension drawing
Fan Size B Max motor frame Approximate
Shipping Weight
(pounds)
90 14-7/16 14-3/8 16-13/16 17-1/2 14-5/16 143T 125
120 17-3/8 17-3/4 20-3/16 20-1/2 14-5/16 145T 150
135 19-1/2 20-1/4 22-11/16 22-5/8 14-5/16 145T 200
150 21-5/8 22-13/16 25-1/4 24-3/4 14-5/16 145T 250
165 23-13/16 25-5/16 27-3/4 26-15/16 14-5/16 182T 255
180 26 27-13/16 30-1/4 29-1/8 14-5/16 182T 275
195 28-3/16 30-1/8 32-3/4 31-5/16 14-5/16 182T 325
210 30-3/8 32-5/8 35-1/4 33-1/2 14-5/16 182T 375
225 32-1/2 35-3/16 37-13/16 35-5/8 17-1/2 184T 425
245 35-3/8 38-9/16 41-3/16 38-1/2 17-1/2 213T 425
270 39 42-3/4 45-3/8 42-1/8 17-1/2 213T 450
300 43-7/16 47-13/16 50-7/16 46-1/2 17-1/2 213T 475
330 47-5/8 52-13/16 55-7/16 50-3/4 17-1/2 215T 555
365 52-3/4 58-15/16 61-3/8 55-7/8 17-1/2 215T 652
402 58-1/4 61-3/4 64-1/4 61-1/2 17-1/2 215T 750

SQI-HP
Loren Cook Company certifies that the SQI-HP shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and AMCA Publication 311 and comply with the requirements of the AMCA Certified Ratings Program.

Type SQI-HP is furnished standard with UL 705 & cUL 705 listing (Power Ventilator/ZACT) when furnished with factory supplied motor.

SQI High Presure

Square Centrifugal
High Pressure
Inline Blower
Belt Drive

  • SQI-HP is available in 13 belt drive sizes.
  • Impeller Size: 13.5 - 40.2 in
  • Flow: 1,500 - 30,100 CFM
  • SP: .125 - 3.5 in

Description: Fan shall be duct mounted, belt driven, high pressure centrifugal square inline.

Certifications: Fan shall be manufactured at an ISO 9001 certified facility. Fan shall be listed by Underwriters Laboratories (UL 705) and UL listed for Canada (cUL 705). Fan shall bear the AMCA certified ratings seal for sound and air performance.

Construction: The fan shall be of bolted construction utilizing corrosion resistant fasteners. Housing shall be minimum 18 gauge galvanized steel with integral duct collars. Bolted access doors shall be provided on three sides, sealed with closed cell neoprene gasketing. Pivoting motor plate shall utilize threaded L-bolt design for positive belt tensioning. Housing shall be pre-drilled to accommodate universal mounting feet for vertical or horizontal installation. Unit shall bear an engraved aluminum nameplate. Nameplate shall indicate design CFM, static pressure, and maximum fan RPM. Unit shall be shipped in ISTA certified transit tested packaging.

Wheel: Wheel shall be centrifugal backward inclined, constructed of 100% aluminum, including a precision machined cast aluminum hub. Wheel inlet shall overlap an aerodynamic aluminum inlet cone to provide maximum performance and efficiency. Wheel shall be balanced in accordance with AMCA Standard 204-05, Balance Quality and Vibration Levels for Fans.

Motor: Motor shall be NEMA design B with class B insulation rated for continuous duty and furnished at the specified voltage, phase and enclosure.

Bearings: Bearings shall be designed and individually tested specifically for use in air handling applications. Construction shall be heavy duty regreasable ball type in a pillow block cast iron housing selected for a minimumL50 life in excess of 200,000 hours at maximum cataloged operating speed.

Belts and Drives: Belts shall be oil and heat resistant, non-static type. Drives shall be precision machined cast iron type, keyed and securely attached to the wheel and motor shafts. Drives shall be sized for 150% of the installed motor horsepower. The variable pitch motor drive must be factory set to the specified fan RPM.

Product: Fan shall be model SQN-HP as manufactured by Loren Cook Company of Springfield, Missouri.

Dimensions (Inches) Sqn-d dimension drawing
Fan Size Approximate
Shipping Weight
(pounds)
70 10-1/8 9-3/4 11-3/4 13-1/8 38
80 13 13 15-1/8 16 43
90 14-7/16 14-3/8 16-13/16 17-1/2 55
120 17-3/8 17-3/4 20-3/16 20-1/2 175
135 19-1/2 20-1/4 22-11/16 22-5/8 232
150 21-5/8 22-13/16 25-1/4 24-3/4 285
165 23-13/16 25-5/16 27-3/4 26-15/16 305

Performance shown is for Installation Type B: Free inlet, Ducted outlet. Speed (RPM) shown is nominal. Performance is based on actual speed of test. Performance ratings do not include the effects of appurtenances in the airstream. *These fans cannot be used with FSC speed controller.

Accessories

Disconnect Switches:

  • NEMA 1 - Indoor, general purpose.
  • NEMA 1 (Lockable) - Indoor, general purpose with lockable switch.
  • NEMA 3R - Exterior mount, weather resistant.
  • NEMA 7 & NEMA 9 (Lockable) - Indoor, explosion proof.

Fan Speed Controller: Cook’s FSC is a variable speed controller which can offer excellent energy conservation and lower sound levels when 100 percent of a direct drive fan operating capacity is not required. The FSC employs solid state circuitry for long-life and dependability. The FSC is available only on 115V and 230V shaded pole or permanent split capacitor direct drive motors and is not available on 1140 RPM and 1725 RPM motors. The FSC is normally shipped loose for field installation. Optional pre-wiring is available.

Flexible Duct Connector: Flex Duct Connectors are available for the inlet or outlet of the SQI. These connectors provide a flexible connection between the fan and the attached ductwork. This reduces the transmission of noise and vibration to the ductwork as well as allowing for slight misalignment and easy removal of the fan without disturbing the rigid ductwork. Flex Duct Connectors consist of reinforced neoprene fabric and aluminum bands.

Inlet/Outlet Companion Flange: Inlet or Outlet Companion Flanges are attached to the adjacent ductwork to provide an exact mate to the flanged connection on the fan.

External Inlet Vane Damper: External Inlet Vane Dampers are used to provide precise air volume control while maintaining maximum efficiency and stable operation at reduced load conditions. Inlet Vane Dampers are available in aluminum construction on sizes 120 through 402. These dampers are factory mounted and provided with an adjustment arm for manual or actuated control (actuator furnished by others). Cataloged performance is based on fans without inlet vane dampers.

Automatic Backdraft Dampers: Automatic Backdraft Dampers feature an extruded aluminum frame, aluminum blades and aluminum hinge pins with nylon bushings. These dampers are shipped loose for field installation.

Motorized Backdraft Dampers: Motorized Backdraft Dampers feature an extruded aluminum frame, aluminum blades and aluminum hinge pins with nylon bushings. These dampers are shipped loose for field installation.

Weather Proofing: Weather Proofing consists of a weather resistant fan housing and motor cover.

Belt Guard: Belt Guards are available which cover the drive assembly on the top, front and sides. The belt guard is constructed of minimum 18 gauge Lorenized® steel and has an open back which allows inspection and belt tensioning without removing the guard. Belt guards are factory installed.

Inlet Safety Screen: Inlet Safety Screens are used in non-ducted installations to protect personnel and prevent debris from entering the fan. This screen is constructed of 1/2” x 1/2” galvanized welded wire and is factory installed.

Outlet Safety Screen: Outlet Safety Screens are used on non-ducted installations to protect personnel and prevent debris from entering the fan. This screen is constructed of 16 gauge 1/2” x 1” expanded metal complete with mounting frame. This assembly is Lorenized® and factory installed.

Insulated Housing: An acoustical lining is available for the interior of the SQI. This fiberglass duct liner provides a reduction in noise of approximately 3dB in each of the eight octave bands.

Aluminum Construction: All aluminum construction is available on all sizes of the SQI’s.

Special Coatings: Special Coatings are available for cosmetic or protective purposes.

Isolators

  • Rubber-in-Shear- Ceiling Mounted
  • Free Standing Spring - Floor Mounted
  • Rubber-in-Shear - Floor Mounted
  • Housed Spring - Floor Mounted
  • Spring - Ceiling Mounted
  • Restrained Spring - Floor Mounted

The SQI is equipped with factory installed mounting brackets for a wide range of options. The mounting bracket design allows for use with vibration isolators. All mounting configurations are viewed facing the discharge of the fan.


Horizontal Ceiling Specify access door at 3:00, 6:00 or 9:00 position.


Wall Mount Specify wall position at 3:00, 9:00 or vertical wall mount installation.


Vertical Ceiling - Upblast


Vertical Ceiling - Downblast


Horizontal Floor Motor and Access should not be placed at 6:00 position.


Wall Mount Specify wall position at 3:00, 9:00 or vertical wall mount installation.


Vertical Floor - Downblast


Vertical Floor - Upblast