Definitions: Vented - requires chimney Vent-free - requires no chimney B-vent - uses indoor air for combustion for combustion and venting Direct Vent - uses outdoor air for combustion and venting Home  |   About Us  |  Gas Lighting  |  Outdoor Kitchen Equipment  |  Fireplaces and Gas Logs  |  Mantels  |  Contact Us Copyright 2009.  All Rights Reserved.  Website by Designs By Kacy.