For optimal effeciency your ducting should be as short as possible with minimal elbows. The longest your ducting should ever be is 50ft, but the shorter it is the more effecient your range hood will be. To calculate your duct length with elbows, please see the example below.
Range hoods should always be vented using metal ductwork. Smooth ducting is better than flexible or ribbed because smooth straight ducting won't reduce or restrict the airflow as much as a flexible duct will. The distance you will need for an elbow changes with each size. 6" ducting needs 9", 8" ducting needs 12" and 10" ducting needs 15". Once you know the desired height from the cooktop to your range hood, add the height of the hood (without chimney covers for chimney hoods) and the height of duct transtion. All of our range hoods have their specific dimension diagrams available on the store page and in their manual.
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- Each 90 degree elbow = minus 9ft - Each 45 degree elbow = minus 5ft - Each round to rectangle transition = minus 7ft - Wall/Roof vent cap with damper = minus 7ft Example: 50 feet - two 90 degree elbows - Wall cap = maximum duct length of 25ft If your ducting is long and/or has more than one elbow, we recommend using a duct bigger than 6" and a range hood stronger than 600CFM.
Where should I install elbows in my ducting?
What type of ducting is best for ventilation?
Always also make sure that your ducting never reduces down lower than the size the range hood comes with. For powerful hoods with more than 600CFM, you will need 8" round or larger ducting.
How do I make sure I have enough room for my ducting to vent out the wall behind my range?
Once you have found the very top of the where the exhaust from the hood fan will be, add the appropriate required space for the elbow and this is the minumum height your ducting should be from the floor. However we recommend elbows should be at least 12" from the top of your hood when possible.
My ceiling is taller than 9 feet, can I still install a chimney hood?
I have no space for an elbow, can I duct into a fabricated box to connect the duct?
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