12
INSTALLATION OF VENT SYSTEM, SIDEW ALL
With the route of the venting system and selection of materials
completed, as discussed in the section of this manual titled
PLANNING THE VENT SYSTEM, the through the wall vent
terminal in place and the first section of piping, up to first elbow,
installed at the blower it is time to complete the installation of the
venting system for the sidewall installation.
FIGURE 8
Before completing the installation of the venting system be sure
to read the sections of this manual discussing the proper method
of cutting and cementing PVC pipe and fittings: VENT PIPE
PREPARATION.
It is recommended that the completion of the venting system start
at the blower assembly and run to the coupling on the inside wall
of the vent terminal, Figure 6.
The vent system piping should be supported every 5 feet of vertical
run and every 3 feet of horizontal run. All piping and fittings must
be joined by the proper procedures as described under: VENT
PIPE PREPARATION.
INSTALLATION OF VERTICAL VENT SYSTEM
A proper flashing or "BOOT" should be used to seal the pipe where
it exits the roof. The total vent system should not exceed the
equivalent feet of pipe as listed in Table 1.
Provide support for all pipe protruding through the roof. All piping
should be properly secured. The vent system piping should be
supported every 5 feet of vertical run and every 3 feet of horizontal
run. All piping and fittings must be joined by the proper procedures
as described under: VENT PIPE PREPARATION.
FIGURE 9
IMPORTANT
The vent system must terminate so that proper clearances
are maintained as cited in local codes or the current edition
of the National Fuel Gas Code, ANSI Z223.1 and as listed
below:
1. Vent Termination must extend a minimum of 18 inches
above roof or 18 inches above the anticipated snow level
to prevent blockage of the vent termination, as shown in
Figures 8 and 9.
2. The venting system shall terminate at least four (4) feet from
or one (1) foot above any gable, dormer or other roof structure
with building interior access; i.e., vent, window, etc.
3. The venting system shall terminate three (3) feet above
any forced air inlet located within ten feet.