Wall venting is a viable option for most kitchens on an exterior wall.
- Use rigid metal duct and keep the run short for best performance.
- Always follow local building codes and install a backdraft damper.
What Does Wall Venting a Range Hood Involve?
Wall venting directs cooking exhaust through a duct to an exterior wall cap. The hood connects to a duct, usually round metal pipe, that exits the house. A wall cap with a backdraft damper keeps outside air out when the hood is off. The duct run should be as short and straight as possible. Every bend reduces airflow and increases noise. Insulated duct is recommended in cold climates to prevent condensation.
How to Vent a Range Hood Through the Wall: Step-by-Step
First, choose a location for the hood directly above the cooktop. Mark the duct path to the nearest exterior wall. Cut a hole in the wall for the duct and wall cap. Install the wall cap from outside, sealing it with caulk. Connect the duct to the hood and run it to the cap. Use metal duct tape on all joints. Finally, plug in the hood and test for proper airflow.
Wall Venting vs. Roof Venting: Which Is Better?
Wall venting is usually easier and less expensive than roof venting. It avoids roof penetrations, which can leak if not sealed properly. Roof venting may be necessary if the kitchen is not on an exterior wall. Wall venting also keeps the duct shorter, improving performance. However, roof venting can be more discreet, as the cap is not visible from the street. Choose wall venting when possible for simplicity and cost savings.
What Are the Building Code Requirements for Wall Venting?
Most local codes require the duct to be made of metal, not flexible foil. The duct must be smooth-walled to reduce grease buildup. A backdraft damper is required on the exterior cap. The duct must not terminate near a window, door, or air intake. Check your local code for specific clearance distances. Some codes require a make-up air system for high-CFM hoods over 400 CFM.
Can You Vent a Range Hood Through an Interior Wall?
Interior walls cannot be used for direct venting because they do not lead outside. You would need to run the duct through the attic or crawlspace to an exterior wall or roof. This adds length and complexity. In multi-story homes, you might route the duct up through the ceiling and out a soffit. Always plan the duct path to minimize bends and length. If no exterior access is possible, consider a ductless recirculating hood instead.