Instruction manual

56
At least 36 in.
18 in. maximu m
V e r tical separation
between comb ustion
air and v ent
8 3/4 in. (222mm)f or 3 in. (76mm)ki t
6 3/4 in. (172mm)f or 2 in. (51mm) ki t
Roof T e rm ination (Pref erred)
Abandoned masonr y
used as race wa y
(per code)
At least
36 in.
A
Maintain 12 in.
min. clearance abo ve
highest anticipated
sno w le ve l, maximum of
24 in . abo v e roof
Concent ri c V ent and Comb ustion Ai r
Roof T er mination (pre fe rred)
1 in. (25mm) maximum (typ) from wall to inlet
12 in. (305mm) minimum fro m
ov erhang or roof
Maintain 12 in.
min. clearance ab ov e
highest anticipated
sno w le v el or grade
which eve r is greate r
A
A
t le
a
s t
3
6
in
.
Concent ri c V ent
and Comb ustion - Air
Side T e rm inatio n
A
At least 36 in.
Side wa ll te rm inatio n
of less than 12
in. (305mm) above highest snow level
12 in. min fro m
ov erhang or roof
12
in. (305mm)
separation between
bottom ofcomb ustion air and
bottom of v ent (typ)
Maintain 12
in.
min. clearance abo ve
highest anticipated
sno w le ve l or grade
whiche ve r is greater (typ)
A
A t least 36 in
.
A
Maintain 12 in. (305mm)min.
clearance abo ve
highest anticipated
sno w le ve l
Maximum of 24 in.(614mm)
abo v e roof
90 °
Note: "A" denotes 0 to < 2 in.
Between the first 2 vents
Third vent must be > 36 in. away
(typ)
(914mm)
(305mm)
(914mm)
(305mm)
(305mm)
(914mm)
(914mm)
(457mm)
(51mm)
(914mm)
A05090
Fig. 47 -- Combustion Air and Vent Pipe Termination for Direct Vent (2--Pipe) System
Abandoned masonry
used as raceway
(per code)
12 in. (305 mm) min. from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
12 in. min. (305 mm)from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe length
Sidewall Termination
with Straight Pipe (preferred)
Roof Termination (Preferred)
Vent
Maintain 12 in .
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof.
90°
(305mm)
A05091
Fig. 48 -- Vent Pipe Termination for Non--Direct Vent and Ventilated Combustion Air System
986TA