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SECTION 2 EDR-SOLA-IOM-2022-0216 INSTALLATION
2-33
Venting Terminations
Adhere to National Fuel Gas Code (ANSI Z223.1) and the
following for installation:
1. Do not terminate the venting in an enclosed area. Care
must be taken when selecting the type and orientation
of the terminations.
2. All vent pipes and ttings must be installed with
appropriate air space clearances to combustibles. These
air space clearances apply to indoor or outdoor vents—
whether they are open, enclosed, horizontal or vertical
or pass through oors, walls, roofs, or framed spaces (See
Figures 22, 23 and 24). The air space clearances should be
observed to joists, studs, sub oors, plywood, drywall or
plaster enclosures, insulating sheathing, rafters, roong,
and any other material classed as combustible.
3. To prevent the possible re-circulation of ue gases,
the vent designer must take into consideration such
things as prevailing winds, eddy zones, building
congurations, etc. Adverse conditions eect operation
reliability and durability of the boiler(s).
4. The required minimum air space clearances also apply
to electrical wires and any kind of building insulation.
5. Listed termination parts must be used.
6. Select the air intake point of penetration where a
minimum of 1/4” per foot (6.35 mm per .3 m) upward
pitch can be maintained.
7. It is recommended to install a mesh bird screen, with
minimum 1/2” by 1/2” openings, at the combustion air
intake termination. Climates subject to extreme cold
may require alternate congurations to provide an
increased surface area, such a cylindrical basket screens.
Consult your venting supplier for recommendations.
8. It is important to locate the exhaust termination in
such a way that it does not become blocked due to
snow, ice, and other natural or man-made obstructions.
If terminating into a prevailing wind, direct elbow
upward. Avoid areas (example: courtyards) where
swirling high winds may be present.
9. The use of rain caps on the ue termination is not
recommended. Rain caps contribute to ice buildup,
stagnant vapor plumes, ue gas recirculation (FGR) and
additional vent pressure loss. See Figure 22 and 23.
Wall Thimble Installation
Adhere to the following for installation (see Figure 21):
1. Insert the thimble through the wall from the outside.
2. Secure the outside ange to the wall with nails or
screws, and seal with adhesive material.
3. Install the inside ange to the inside wall, secure with
nails or screws, and seal with adhesive material.
4. Pass the vent pipe through the thimble from the
outside and join to the rest of the vent system. Seal the
pipe to the thimble ange with adhesive material.
5. Install two pipe retaining clamps around the intake as
well as vent pipes on both ends of the wall thimble (on
the inside and outside of the wall) through which intake
and vent pipes are passed. They will prevent the intake
and vent pipes from being pushed or pulled.
Roof Vent Termination
Adhere to the following for installation (see Figure 22 and 23):
1. The minimum vent height should extend at least 3 feet
(0.9 m) above the roof, or at least 2 feet (0.6 m) above
the highest part of any structure within 10 feet of the
vent.
2. When installing inlet and exhaust terminations
above the roof, the exhaust outlet must be installed
4 feet (1.22 m) minimum above and 4 feet (1.22 m)
minimum downwind from air supply inlet to prevent
exhaust recirculation. Greater separation is strongly
recommended.
Side Wall Vent Termination
Adhere to the following for installation (see Figure 24):
NOTE: The vent termination is joined to the vent pipe outside
the wall. Use the same joining procedures for vent pipe and
ttings.
1. When penetrating a non-combustible wall, the hole
through the wall must be large enough to maintain
the pitch of the vent and provide sealing. Use adhesive
material to seal around the vent on both sides of the
wall. When penetrating a combustible wall, a wall
thimble must be used.
2. High-wind areas may require special termination
consideration. See Figure 24.
3. The termination of the vent system must be at least 12
inches (30.48 cm)above the nished grade, or at least
12 inches (30.48 cm) above normal snow accumulation
level (for applicable geographical areas).
4. The termination of the vent system shall not be located
over trac areas such as public walkways, or over
an area where condensate or vapor could create a
nuisance or hazard.
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