Type B gas vent pipe and fittings are
Underwriters Laboratories-tested and listed to
Standard 441 for use with listed gas-fired appliances
that have been certified for use with Type B gas vent.
B-Vent is intended for neutral or negative draft
applications. It is designed for vertical installations
(including laterals) but may be used for horizontal
applications with a draft-inducing fan located such
that all indoor portions of the vent are under negative
pressure.

The materials in this B-Vent have been selected to
provide maximum resistance to corrosion and heat;
however, their use with temperatures exceeding
550° F or in highly corrosive atmospheres, such as
chlorinated hydrocarbons (i.e., refrigerants, drycleaning
fluids, degreasers, paint removers, etc.),
may substantially reduce their life expectancy.