Question: We are remodeling our kitchen. How do I know the right size range hood to purchase?
Answer: There are a few factors which I cover on the website. They include the size of the cooking surface, the height from the cooking surface to the range hood and your cooking habits.
As a rule of thumb, you can use four cfm for every lineal inch of cooking surface width to determine the size of the exhaust fan and the hood itself should, at a minimum, cover the surface of the cooktop.
I would also like to point out the need to consider exhaust fan make-up air. when installing any exhaust fan.
Makeup air is the air that replaces the air that has been exhausted. Today’s construction methods are making homes tighter in order to afford energy reduction. They are built specifically to keep outside air from entering the home and the tighter the home the worse the makeup air problem.
If you install an exhaust fan that moves 300 CFM (cubic feet per minute) of air from your home, you have to replace that air. In theory, if the fan was powerful enough, which it isn’t, it would suck the air out of the home and the walls and ceiling would collapse inward.
Although the walls and ceiling will not collapse in a home, things that are as bad or maybe even worse may happen. In order for your home to replace the air that has been exhausted, it will look for any opening to the outside. Items that are vented to the outside of your home include gas water heaters, clothes dryers and furnaces, oil fired furnaces and wood or gas fireplaces.
An exhaust fan that is fighting for makeup air can and will create a backdraft, in other words instead of the air moving upwards from your fireplace and out the chimney it will actual cause the air to flow down the chimney and through the fireplace hearth and into the home. The same situation applies to heating appliances such as water heaters and furnaces. Instead of exhaust gases going up their chimney, fresh air will be sucked down the pipes and into the home.
This can be extremely dangerous as those items are exhausting hazardous gases including carbon monoxide
Additional information on sizing a kitchen range hood.
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