Why Rooftop Exhaust Fans Need Attention During Hood Cleaning

Vapor that makes it through the duct condenses at the fan housing and, without a containment system, runs onto the roof membrane.

That creates both a fire concern and a roofing warranty problem.

Grease-loaded blades go out of balance, belts glaze, and bearings wear early. A fan running below rated speed leaves more grease in the duct, which accelerates everything.

Hinge kits should be checked so the fan can be tilted safely for service.

Housing and blade cleaning to bare metal, belt and bearing inspection, hinge and safety cable check, and containment pads replaced.

Documenting fan condition each visit catches wear before it becomes a shutdown.

• Blades and housing cleaned to bare metal
• Belt tension and wear checked
• Hinge kit and safety cable verified
• Grease containment replaced
• Roof surface degreased around the curb

Some low-cost hood cleanings stop at the filters. Confirm the rooftop fan is included in writing before booking.