Appliance Repair Questions? Ask a Technician for Answers ASAP
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If this is new construction have the framer build a box for the size of the vent pipe. If this is the hole in the outside wall have a sheet metal person size a fitting that will go from the vent pipe size to the hole size. You will need to keep the cross section area the same or larger. Also if it is the out side you may have to have a custum door or damper made for it.