FIG. 8 - TYPE B GAS VENT
9
For boilers for connection to gas vents or
chimneys, vent installations shall be in
accordance with Part 7, Venting Equipment,
of the national Fuel Gas Code, ANSI Z223.1-
latest issue and applicable provisions of the
local building codes. In Canada, follow CSA
13149.1 or .2 Installation Codes.
Vent connectors serving appliances vented
by natural draft shall not be connected into
any portion of mechanical draft systems
operating under positive pressure.
If boiler is installed with single wall vent, it must
have a 6" clearance between its surface and any
combustible material. A new Type B gas vent
orflexible liner must be installed in accordance
with the instructions furnished with the vent.
Maintain clearances as specified for the vent pipe.
Check the vent pipe to see if it is firestopped
where it goes through the floor or ceiling. It
should have an approved vent cap with
clearances from the roof as shown in Fig. 8. If
clearances are less than shown in Fig. 8, have
the vent checked by local authorities.
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