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SECTION 2
EDR-PURE-IOM-230608
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
con gurations, etc. Adverse conditions e ect 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 con gurations 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.
ƒ 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.
(TYPICAL 4 PLACES)
ORIENT CLAMPS AND COLLAR AS REQUIRED
3½ INCH OR
4.35 CM AIR GAP
ALL AROUND
THRU PIPE
DIAMETER "C"
STAINLESS
VARIABLE
(MIN. 3 ¼ IN) – (MAX. 20 INCHES)
(MIN. 8,255 CM – MAX. 50,8 CM)
FIGURE 21 WALL THIMBLE INSTALLATION
Questions? Please Contact Your Local Manufacturer's Representative
PIPE RETAINING
CLAMP, TYPICAL
EACH SIDE
END VIEW
DIAMETER "B"
ADJUSTABLE
WALL THIMBLE
WIDTH TO VARY WITH
WALL THICKNESS
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.
ƒ 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.
3. The use of rain caps on the ue gas exhaust termination
is not recommended. Rain caps contribute to ice
buildup, stagnant vapor plumes, ue gas recirculation
(FGR) and excess vent restriction. See Figure 22 and 23.
ƒ 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
DIAMETER "A" COLLAR
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).
INSTALLATION
2-31
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