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ATTACH 45°
BRACKET
TERMINATION
ELBOW
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
12 in.
VENT
(30 cm) min.
RISER
GROUND
LEVEL*
* WHERE SNOW COVER IS NORMAL DURING WINTER,
ENSURE SUFFICIENT VENT CLEARANCE TO PREVENT
BLOCKAGE OR ICE BUILDUP.
FIGURE 26
INSTALLATION OF VERTICAL VENT SYSTEM
A proper fl 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 ft. (1.5m) of vertical run and
every 3 ft. (91cm) of horizontal run. All piping and fi ttings
must be joined by the proper procedures as described
under "Vent Pipe Preparation".
FIGURE 27
28
EQUIVALENT
VENT LENGTH
MEASURED
FROM THIS
POSITION
SEALANT
VENT
PIPING TO
BE SLOPED
SEALANT
(DOWN)
TOWARD
HEATER TO
PREVENT
WATER FROM
COLLECTING.
3 in. (7.6cm)
MIN. LENGTH
A VENT USED IN A SPECIAL
VENTING SYSTEM WITH POSITIVE
VENT PRESSURE AND PASSING
T H R O U G H A R O O F S H A L L
EXTEND AT LEAST 450mm (18
in.) ABOVE THE HIGHEST POINT
WHERE IT PASSES THROUGH
THE ROOF SURFACE AND ANY
OTHER OBSTRUCTION WITHIN
A HORIZONTAL DISTANCE OF
450mm (18 in.). A VERTICAL
VENTING SYSTEM MUST BE
SUPPORTED EVERY 1.5m (5 ft.).
FIGURE 28
VENT PIPE PREPARATION
1. INITIAL PREPARATION.
A. Make sure the solvent cement you are planning to
use is designed for the specifi c application you are
attempting.
B. Know the physical and chemical characteristics and
limitations of the PVC and CPVC piping materials
that you are about to use.
C. Know the reputation of your manufacturer and their
products.
D. Know your own qualifications or those of your
contractor. The solvent welding technique of joining
PVC and CPVC pipe is a specialized skill just as any
other pipe fi tting technique.
E. Closely supervise the installation and inspect the
fi nished job before start-up.
F. Contact the manufacturer, supplier, or competent
consulting agency if you have any questions about
the application or installation of PVC and CPVC
pipe.
G. Take the time and effort to do a professional job.
Shortcuts will only cause you problems and delays
in start-up. By far, the majority of failures in PVC and
CPVC systems are the result of shortcuts and/or
improper joining techniques.
2. SELECTION OF MATERIALS.
• Cutting Device - Saw or Pipe Cutter.
• Deburring Tool, Knife, File, or Beveling Machine (2
in. and above).
• Brush - Pure Bristle.
• Rag - Cotton (Not Synthetic).
• Primer and Cleaner.
• Solvent Cement - PVC for PVC Components and
CPVC for CPVC Components.
• Containers - Metal or Glass to hold Primer and
Cement. Select the type of PVC or CPVC materials
to be used on the basis of their application with
respect to chemical resistance, pressure rating,
temperature characteristics, etc.
• Insertion Tool - Helpful for larger diameter pipe and
fi ttings 6 in. (15cm) and above.
TERMINATION
MAY BE 45°
ELBOW OR A
"T" ELBOW
RODENT
SCREEN
18 in.
(INSTALL
(45cm)
INTO
ELBOW)
ROOF
LINE
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