4. VENTING
Install vent system in accordance with Part 7, Venting of
Equipment, National Fuel Gas Code, ANSI Z223,1/NFPA
54 or applicable provisions of the local building codes.
This vent system will operate with a positive
pressure in the vent pipe. Do not connect vent
connectors serving appliances vented by natural
draft into any portion of mechanical draft systems
operating under positive pressure.
Flue gases will condense as they exit the vent
termination. This condensate can freeze on exterior
building surfaces which may cause discoloration of
these surfaces.
1 Determine vent cap (terminal) location.
a Must be within the maximum and minimum vent
and air intake lengths shown in Tables 1 and 2.
b Maximum wall thickness for the 1%1/2" long
Peerless Wall Thimble (standard)is I 1-I/2".
Maximum wall thickness for the optional 28"
long thimble is 20".
C
Provide 2" clearance between vent pipe and
combustible construction No clearance is
required between Thimble and combustible
construction
d. Provide 3 feet clearance above any forced air
inlet within I0 feet.
e. Provide 1 foot clearance below. 1 foot beside, or
1 foot above any door, window, or gravity air
inlet into any building
Provide 1 foot clearance between bottom of vent
terminal and ground level and normal snow
lines.
g.
h.
Provide 4 feet horizontal clearance from. and in
no case above or below, unless a 4 foot
horizontal distance is maintained, from electric
meters, gas meters, regulators and relief
equipment.
Do not locate vent terminal over public walkways
where condensate could createa nuisance or
hazard.
i.
j.
When adjacent to a public walkway, locate vent
terminal at least 7 feet above grade
Do not locate directly under roof overhangs to
prevent icicles from forming
2. Cut a 5-]/8" square hole in sidewall to allow Peerless
Wall Thimble to go through
3. Insert Thimble from inside wall with 4" diameter air
inlet connection facing down. Extend Thimble 3-I/2"
past outside wall surface. The cut-out opening of
thimble is pointed down.
COLLAR
INSIDE THIMBLE CAP
/
3" DIA CLAMP /
PEERLESS WALL THIMBLE
3" DIA CLAMP
!
OUTSIDE 3" DIA
VENT PIPE
VENT CAP
Figure 8: Peerless Wall Thimble
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