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How do I size my kitchen ventilation system?
Wall Mount Installations:
100 CFM per foot of hood width
Before choosing your kitchen ventilation fan, check with your local residential
codes and the range manufacturer’s recommendations. If the range
manufacturer’s recommendations are not available, use the information below
to calculate the fan size. These recommendations follow the guidelines of the
Home Ventilating Institute (HVI).
Example: 36” (3 ft.) wide
hood will require 300 CFM.
Hood Width 3
CFM per Foot x 100
Air flow [CFM] 300
Island Mount Installations:
150 CFM per foot of hood width
Example: 36” (3 ft.) wide
hood will require 450 CFM.
Hood Width 3
CFM per Foot x 150
Air flow [CFM] 450
When using a gas cooktop or range, it is recommended that the hood liner be 6” wider than the cooktop.
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