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20
INSTALLATION OF VENT SYSTEM, SIDEWALL
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 rst section
of piping, up to rst elbow, installed at the blower it is time to complete the
installation of the venting system for the sidewall installation.
FIGURE 19.
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 ttings: 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, see Figure17.
The vent system piping should be supported every 5 feet (1.5 m)
of vertical run and every 3 feet (91 cm) of horizontal run. All piping
and ttings must be joined by the proper procedures as described
under: VENT PIPE PREPARATION.
INSTALLATION OF VERTICAL VENT SYSTEM
A proper ashing 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 (1.5 m) of vertical run and every 3 feet (91 cm)
of horizontal run. All piping and ttings must be joined by the proper
procedures as described under: VENT PIPE PREPARATION.
FIGURE 20.
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 (46 cm) above
roof or 18 inches (46 cm) above the anticipated snow level to prevent
blockage of the vent termination, as shown in Figures 19 and 20.
2. The venting system should terminate at least four (4) feet (1.2 m)
from or one (1) foot (30 cm) above any gable, dormer or other roof
structure with building interior access; i.e., vent, window, etc.
3. The venting system should terminate three (3) feet (91 cm)
above any forced air inlet located within ten feet (3.0 m).