Extraction or recirculating system
A ducted hood is the best option. However, if it is not possible to install ductwork to draw foul air outside, you need to turn to a recirculating hood.
Ductless Hoods - Recirculating
This type of hood operates as follows: a charcoal filter cleans foul air, removes most grease particles and odours and returns the air to the kitchen.
Ductless hoods are simpler to install but are considered less effective than ducted hoods, since they return air back into the kitchen without extracting smoke, heat or moisture.
Ducted Hoods - Extraction
This type of hood completely eliminates foul air, venting it outside the house through ductwork. These hoods are very popular and constitute the most effective way of meeting ventilation standards as set out in the National Building Code of Canada. Installing a ducted range hood is more complicated because of the ductwork involved; once that is in place, installation of the hood is quickly completed.