A kitchen hood contains a fan that hangs above the stove or cooktop in the kitchen. It Extracts combustion products, fumes, smoke, heat, and steam from the air above the stove. Commercial vent hoods may also be combined with a fan that draws in the fresh air.
In most exhaust hoods, a filtration system removes grease (the grease trap) and other particles.
Hotels can also be able to divert the air extracted through a scrubber to remove odours before being released outside which keeps the air clean.