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VENTED APPLIANCE Category IV
An appliance which operates with a positive vent static pressure and with a vent gas temperature below a value, both measured as specified in the appropriate nationally recognized appliance standard.
VENTED ROOM HEATER
A vented self-contained, free standing, nonrecessed, gas-burning appliance for furnishing warm air to the space in which installed, directly from the heater without duct connections.
VENTED WALL FURNACE (RECESSED HEATER)
A self-contained vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated through openings in the casing. Such appliances shall not be provided with duct extensions beyond the vertical and horizontal limits of the casing proper, except that boots not to exceed 10 inches (254 mm) beyond the horizontal limits of the casing for extension through walls of normal thickness may be permitted. Where such boots are provided they shall be supplied by the manufacturer as an integral part of the appliance and tested as such. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined.
Any pipe or fitting that makes an angle of 45 degrees (0.79 rad) or more with the horizontal.