Vented Gas Fireplaces
Use air cooled pipe (B-vent), or gas flex liners to vent appliances. This type of appliance uses room air for combustion and exhausts through the B-vent pipe or flexible gas liner. Vented appliances are not as restricted in venting length as compared to direct vent appliances and can utilize existing chimney systems by running gas flex liner into existing chimneys and terminating with a raincap and flashing.
ZV3600/4200 featured above