I'm trying to figure out the right duct size for my 320 CFM range hood. The duct run is about 18.5 feet long and includes one elbow. Online, the recommendations seem to vary between 4-inch and 6-inch ducts. However, an HVAC professional advised me to go with a 6-inch duct to avoid low air velocity and ensure efficient ventilation. What do you think?
1 Answer
Honestly, going with a 6-inch duct is a smart move, especially since you have that long run and an elbow. It helps maintain airflow and efficiency, which is key for your hood. Most standard recommendations for hoods over 600 CFM call for at least 6-inch ducts, so your 320 CFM setup will likely work best with the larger size too!
Plus, it’s always safer not to choke the airflow if you can help it!
That makes sense! I’ve heard that smaller ducts can really hinder performance, so I guess bigger is better here.