16
SEALANT
ATTACH
TERMINATION
ELBOW (MAY
ALSO BE 90º)
12 in.
MIN. *
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
COVER PLATE
(OPTIONAL)
GROUND
LEVEL*
SEALANT
(UNDER
PLATE)
*WHERE SNOW COVER IS NORMAL DURING
WINTER, ENSURE OUTLET IS INSTALLED
ABOVE ANTICIPATED SNOW LEVEL.
VENT PIPING MAY
BE SLOPED IN ANY
DIRECTION, AS
LONG AS A WATER
TRAP IS NOT
CREATED IN THE
VENTING SYSTEM.
TH SLOPE
SHOULD BE KEPT
TO A MINIMUM
SO AS NOT TO
EXERT ANY UNDUE
STRESS ON THE
PIPE.
SEALANT
VENT PIPPING TO BE
SLOPED (DOWN)
TOWARD HEATER
TO PREVENT
WATER FROM
WATER FROM
COLLECTING
(MAY REQUIRE
A CONDENSATE TEE).
ATTACH
TERMINATION
ELBOW (MAY
ALSO BE 90º)
12 in.
MIN. *
*WHERE SNOW COVER IS NORMAL DURING
WINTER, ENSURE OUTLET IS INSTALLED
ABOVE ANTICIPATED SNOW LEVEL.
BRACKET
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
SEALENT
(UNDER
PLATE)
GROUND
LEVEL'
VENT
RISER
COVER PLATE
(OPTIONAL)
EQUIVALENT
VENT LENGTH
MEASURED
FROM THIS
POSITION
Venting instructions
1. Plan the venting layout starting at the vent termination and
work back toward the heater. Take into consideration the
style and position of the vent termination, the vent pipe
routing, elbows and connectors required and the necessary
support hangers.
2. Venting should be as direct as possible with the fewest
number of fittings. Use long radius 45 degree and long radius
90 degree elbows wherever possible.
3. Avoid using 90 degree elbows “back to back” and do not
use street elbows. Maintain a minimum 6 in. straight section
between elbows. Closely coupled and short radius elbows
reduce the venting capacity. Figure 14 shows examples of vent
pipe connections.
4. DO NOT USE AN ELBOW AS A SUPPORT POINT. Elbows
are not designed to carry the weight of the venting system.
5. Calculate “Equivalent Vent Length” before starting. Do not
exceed the values shown in Table 1.
6. Measure the vent piping and cut to required lengths. Pipes
must be cut at right angles and deburred to ensure a good
smooth fit with sufficient overlap for the glue joints. Correct
any interference conditions.
7. Provide support hangers for horizontal vent piping every 4
ft. to prevent sagging and stress. Provide a minimum of 1/8
in. rise per 4 ft. of vent piping to ensure adequate drainage
(polypropylene vent systems require a 1/4 in. rise per 1 ft.
of vent pipe). Horizontal vent piping must not sag to form
valleys where condensate can collect. Vertical venting shall
be supported every 5 ft. Use appropriate support straps and
vibration isolators (foam pads) on straight sections only. Allow
sufficient clearance for expansion and contraction of the
venting system.
8. At the point where the venting exits the building, cut a
3-1/2” hole for 3” venting or a 4-1/2” hole for 4” venting. For
sidewall applications.
11. Do not seal the vent piping to the wall until the venting is
properly connected to the blower assembly.
12. Complete the venting installation by sealing around the
termination assembly where it passes through the outside
wall, inside and out, with silicone or other suitable sealant.
BEWARE OF CONCEALED WIRING AND PIPING INSIDE THE
WALL.
Caution: Solvent cements may produce flammable vapors. Use only
in well-ventilated areas and keep away from all sources of ignition.
Note: DO NOT use solvent cement on polypropylene vent
systems.
9. Insert the vent piping through this hole and secure into
position. Connect the vent pipe to the end termination
elbow as shown in Figure 16 through Figure 18.
10. Dry fit all vent pipes, elbows, connectors and fittings before
joining any parts with solvent cement. PARTS MUST FIT
WITH OUT STRESS OR BENDING OF ANY SECTION and
each connection must overlap a minimum of 1/2 in. Do not
force fit any of the connections. Use only the appropriate
solvent cement.
Fig. 16
Fig. 17
Summary of Contents for Standard Residential
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