How To: Properly Duct a Range Hood

The most important part of ducting a range hood is ensuring that the duct size is large enough for your needs. If you require anything more than 350CFM, your duct size must be a minimum of 6” in diameter. A 6” duct will allow for a maximum of 600 CFM. If you need more than 600CFM, then your duct size must also be larger. An 8” duct size will allow for up to 900 or 1000 CFM depending on the range hood. A duct size of 10” will allow for up to 1200 CFM.

Please note: The entire duct run must be the same size. Reducing the duct an any point will reduce the suction and efficiency of the range hood. 

Duct Size

• Minimum recommendation is 6” for any range hood
• Optimal duct size for heavy cooking is 8” or 10”
• The wall cap or roof cap must be the same size as the duct (do not reduce it)

Duct Type & Length

• Make the ducting as short as possible for best performance
• We recommend using rigid ducting (not flexible)
• A piece of flex duct may be required for some installations (built-in or back-vented)
• Use aluminum foil tape to secure duct work


• Avoid using more than (1) 90 degree elbow if possible
• Use a rigid adjustable elbow instead of a flexible duct
• Every additional elbow will add to the total static pressure and will affect performance

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