Questar Gas - Good Practices for Gas Piping and Appliance ...

1) Horizontal-type Central Furnace - A furnace designed for
low headroom installations with air flow through the
appliance in a horizontal path.
2) Upflow-type Central Furnace - A furnace designed with
air flow essentially in a vertical path, discharging air at or
near the top of the furnace.
3) Downflow-type Central Furnace - A furnace designed with
air flow essentially in a vertical path, discharging air at or
near the bottom of the furnace.
4) Multi Position Furnace - A furnace designed to be installed
upflow, downflow and horizontal.
c. RECESSED FURNACE - A self-contained appliance complete
with grilles or equivalent, designed for incorporation in or
permanent attachment to a wall, floor, ceiling, or partition; either
taking air for combustion from the space to be heated, or having
a sealed combustion system the inlet and outlet of which
communicates only with the outside air, and furnishing heated
air circulated by gravity or by a fan directly into the space to be
heated through openings in the casing.
GAS HOSE - A gas conduit which depends for tightness on joint
packing on any wall structure other than that formed by a continuous
one-piece metal tubing member. Listed gas hose connectors shall
be used in accordance with the terms of their listings.
GAS PIPING - Any installation of pipe, valves or fittings used to
convey fuel gas, installed on any premises or in any building, but
shall not include:
1) Any portion of the service piping.
2) Any approved piping connection 6 feet (1.8 m) or less in
length between an existing gas outlet and a gas appliance
in the same room with the outlet.
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