First post on the site so take it easy on me I'm replacing my Lennox Propane Fireplace with a Quadra Fire Castile. The vent pipe from the propane fireplace is a 6 inch exhaust pipe and I was wondering what everyone's thoughts are on just running the 3in vent pipe for the pellet insert inside the 6 inch pipe. This is a wood framed chimney chaise. Looking for some guidance and thoughts on this. Thanks!