STjh 2808 CFM centrifugal roof exhaust fan with a large upblast hood and wider curb cap on white.

STJH-CENTRIFUGAL-ROOF-EXHAUST-FAN-2808CFM

Centrifugal Roof Exhaust Fan 2808 CFM

The largest selected direct-drive upblast fan for higher-flow facility exhaust and pressure-control systems.

851-2808 CFM range
3/4 hp variable-speed drive
22 x 22 in curb cap

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Product Introduction

This upblast fan covers 851-2808 CFM with a 3/4 hp variable-speed motor and a visibly larger 22 x 22 in curb cap. The increased wheel, motor section and roof opening distinguish it from the two 19 in-cap units. It suits higher-flow clean-facility exhaust and pressure control where a direct drive is preferred, subject to discharge separation and roof structural coordination.

Key Features

Largest selected roof capacity

The broader wheel and curb serve higher-flow exhaust zones without a belt drive.

Pressure-control modulation

Variable motor speed can track changing room or duct pressure demand.

Higher discharge elevation

The larger upblast assembly directs exhaust vertically away from the roof surface.

Technical Parameters

Airflow Range	851-2808 CFM
Motor	3/4 hp
Drive	Direct variable speed
Curb Cap	22 x 22 in
Discharge	Vertical upblast
Wheel	Large centrifugal direct-drive wheel
Installation	Engineered roof curb
Control	Variable-speed pressure or airflow control
Primary Duty	Higher-flow facility exhaust
Customization	Available based on the intended application and operating environment.

Applications

For larger cleanroom support exhaust, central laboratory ventilation and building pressure-control discharge systems.

Solutions for Your Application

Exhaust is re-entrained into a nearby outdoor-air intake.Coordinate discharge height, velocity, wind effects and separation from intakes using the final roof layout.

The larger 22 in curb conflicts with existing roof steel.Verify opening and support locations before ordering the curb and cutting the roof.

Available Options

Confirm flow and static, voltage, controller, curb height, damper, disconnect, discharge accessories, coating and structural attachment.

Planning a Centrifugal Roof Exhaust Fan 2808 CFM specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

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