All QHT direct vent systems are designed, tested and certified to be used on the specified BIASI boilers.

All vent packages are non-powered, positive pressure, side-wall venting systems and are supplied with all the necessary fittings to make installation quick, clean, and easy.

Oil Direct Vent Systems:
All oil direct vent packages consist of stainless steek. double wall, flexible exhaust duct pipe and aluminum, flexible intake duct pipe. There are two versions of oil vent kits available. The first version is the DVS-4,6 system which uses separate hoods for intake air and exhaust gases. The separate hood design isolates the intake air and exhaust gases minimizing the possibility of cross contamination. The second version is the DHV-5 system which uses a single hood for intake air and exhaust gases. Since the concentric hood design utilizes a single hood for the intake air and exhaust gases, it is only neccesary to provide one a penetration through the house.

Gas Direct Vent System
The gas direct vent package consists of rigid, z-vent exhaust duct pipe (with integrated rubber gaskets) and flexible, aluminum intake duct pipe. It is a concentric system (DVG-4) consisting of a single hood (single penetration through wall) which provides the exhaust outlet for the boiler as well as the combustion air intake for the burner.

All direct vent systems should be installed by a technician on the leeward side of the house out of the wind. If a system must be installed in a high wind situation, one of the DVS packages should be chosen. The separate hood design will avoid possible contamination of the exhaust gas into the intake air, which can result from the high winds.