66
Ve
nting
MULTIVENTING OF DIRECT-VENT FURNACES
GENERAL VENTING REQUIREMENTS AND
GUIDELINES
FIGURE 33
TWO FURNACE VENTING
FIGURE 34
TWO FURNACE VENTING WITH CONCENTRIC VENTING
3” (8cm) MIN.
12” (32cm) MAX.
COMBUSTION
AIR INTAKE
2” PVC
SEE DETAIL
“A”
A
See
8”/20cm
MIN.
12”/31cm MIN. ABOVE
GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL.
CANADA: MUST CONFORM TO
CSA B149.1-10, SECT. 8.14
Figures 33 & 34
:
NOTE: WHEN VENTING MULTIPLE FURNACES IN CLOSE PROXIMITY, EACH FURNACE MUST BE
INDIVIDUALLY VENTED – NO COMMON VENTING IS PERMITTED. See
Figures 33 & 34
for positioning of the termina-
tions. When more than two furnaces are to be vented, there must be at least 4 feet between the first two furnaces and the
third and etc.
Figure 33, (Detail A)
below shows the necessary detail for the roof penetration on a standard direct-vent
vertical termination.
MINIMUM 12”/31cm IN
U.S. ABOVE AVERAGE
SNOW ACCUMULATION.
MAXIMUM OF 24”/61cm
ABOVE ROOF.*
A
SEE
6’ (1.8m) MINIMUM
10’ (3m) RECOMMENDED
A
SEE
MINIMUM 12”/31cm
ABOVE GRADE IN U.S.
*
ST-A1194-18
DETAIL
ST-A1194-21
ST-A1194-22
DETAIL A
CONCENTRIC VENTING THROUGH ROOF
CONCENTRIC VENTING THROUGH WALL
TWO PIPE VENTING THROUGH ROOF
TWO PIPE VENTING THROUGH WALL
DIRECT VENT VERTICAL TERMINATION DETAIL
*3” (8cm) minimum only if no snow accumulation is anticipated.
*
CANADA: TERMINATION MUST CONFORM TO CSA B149.1-10,
SECT 8.14.
ST-A1194-22
2 FURNACES
➀
Terminations must be greater than 8” apart.
➁
Terminations must be less than 24” apart or greater than
➁
36” apart.
3rd OR MORE FURNACES
Each additional termination must be greater than 48” from
the previous termination.
A
TERMINATIONS MORE THAN
24” ABOVE ROOF PENETRA-
TION REQUIRE ADDITIONAL
SUPPORT.
A
NOTE:
IF 3
Ø
VENTING IS
USED, BOTH
PIPES (INTAKE
AND EX-
HAUST) MUST
BE REDUCED
TO 2
Ø
BEFORE
PENETRATING
ROOF.
*
12” (31cm) U.S.
CANADA: TERMINATIONS
MUST CONFORM TO
CSA B149.1-10, SECT. 8.14
48” MAX.
(122 cm)
45” MAX.
(114 cm)
36” MAX.
(91 cm)
3” MIN.
(8 cm)
NOTE:
IF 3
Ø
VENTING IS USED,
BOTH PIPES (INTAKE
AND EXHAUST) MUST
BE REDUCED TO 2
Ø
BEFORE PENETRATING
ROOF.
Summary of Contents for 96MDT SERIES
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