Wood stoves require 6" or 8" Insulated pipe through all combustible structures as well as exterior. There are some places that still have the old triple wall pipe, but I am not a fan of using those because of the fire danger. You CAN'T use the vent tube for gas nor would you want to do this because of the fire danger. You can vent through a brick chimney on older homes that were built with a fireplace using a fireplace insert Your home likely has a vent tube for the gas and this is not workable for a wood stove. Although, you can get a high BTU output gas stove. I have two wood stoves in my house; this is the nice thing about living in the woods on A2 property because I can do whatever I want as long as it meets code.