Below are the types of Kitchen Exhaust Fans:
Ducted Exhaust Fans – A ducted fan uses an air duct to push the indoor air and moisture out. It empties the kitchen air into outside air in the exterior of your home and is very effective and efficient in removing smoke and humidity.
Non-Ducted Exhaust Fans – Non-ducted exhaust fan filter the air using charcoal and then release the fresh and clean air back into your kitchen. They are basically a closed system that is installed inside your kitchen only and is less effective than duct ventilation systems.