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Range Vent Hood How Things Work

Vent Hood
Vent hoods are usually built-in and are wired directly to the household electrical system. They have few components and a simple principle.
Components
Principle
Components
Vent hoods are simply a fan and/or light housed in a metal and/or glass shroud.
Principle
The metal/glass shroud acts as a deterrent to the spread of a stovetop fire, and helps to collect cooking fumes. The fan performs either of two actions:
It draws fumes and odors up or down--depending on the style of vent hood--through a grease filter inside a duct system and out of the house.
Or it draws fumes and odors over an activated-charcoal filter and recirculates the air, back into the room.