Commercial Kitchen Exhaust Fan Repair
Diagnostics for roof-mounted centrifugal upblast exhaust fans used over restaurant and commercial-kitchen hoods — including no-start, weak airflow, vibration, belt, bearing, motor and grease-related concerns.
Independent service by KONGRA LLC. We are not affiliated with or authorized by the manufacturers named on this site. Model coverage, service scope and visit fees are confirmed before an appointment.
Rooftop exhaust fan problems we diagnose
Roof-mounted upblast fan documented on site
This installation is a roof-mounted centrifugal upblast fan serving a commercial-kitchen ventilation system. Before parts are selected, the service visit confirms the fan nameplate, direct- or belt-drive arrangement, motor data, rotation, wheel condition and the relationship between the hood, duct and roof fan.
What the major upblast-fan manuals emphasize
Wheel & airflow
Greenheck's CUE/CUBE manual warns that reversed rotation reduces airflow and can overload the motor. It also notes that dirt or grease buildup on the wheel can create imbalance, vibration and unsafe operation.
Belts, pulleys & bearings
Belt-drive units require periodic belt wear, tension and pulley-alignment checks. Misaligned pulleys can cause belt wear, vibration, noise and power loss; bearing lubrication intervals depend on duty and environment.
Grease management
Restaurant upblast fans require regular cleaning and grease-receptacle maintenance. Grease accumulation can affect balance and also create roof and fire-safety concerns, so fan maintenance is coordinated with hood-cleaning requirements.
Equipment-class manuals
Greenheck CUE / CUBE upblast roof exhaust — IOM
Reference for Greenheck direct- and belt-drive centrifugal upblast fans. Not an identification of the photographed fan.
CaptiveAire centrifugal upblast exhaust fan manual
Equipment-class reference for direct-drive roof and wall mounted upblast exhaust fans.
Independent service
Related commercial services
Frequently asked questions
Do you service rooftop restaurant exhaust fans?+
KONGRA can evaluate selected roof-mounted centrifugal upblast exhaust fans and related controls. Exact model and service scope are confirmed from the fan nameplate before parts are ordered.
Why is a kitchen exhaust fan vibrating?+
Common causes include wheel buildup or imbalance, belt and pulley problems on belt-drive units, loose fasteners, worn bearings or wheel contact. The cause is confirmed by inspection rather than assumed from the noise alone.
Is the fan in the field photo a confirmed Greenheck or CaptiveAire model?+
No. The photo documents a roof-mounted upblast fan, but the manufacturer data plate is not readable enough to identify the exact brand or model. Greenheck and CaptiveAire manuals are used here only as equipment-class references.