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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 3 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.
FIGURE 33
TWO FURNACE VENTING
TWO PIPE VENTING THROUGH ROOF
TERMINATIONS MORE THAN 24"
ABOVE ROOF PENETRATION RE-
QUIRE ADDITIONAL SUPPORT.
12" (32cm) MAX.
TWO PIPE VENTING THROUGH WALL
B
12"/31cm MIN. ABOVE
GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL.*
36"
*CANADA: TERMINATION MUST
CONFORM TO CSA B149.1-10,
SECT. 8.14
DIRECT VENT VERTICAL TERMINATION DETAIL
48" MAX.
45" MAX.
*
(122 cm)
(114 cm)
3" MIN.
(8 cm)
*3" (8cm) minimum only if no snow accumulation is anticipated.
66
NOTE: IF 3 Ø VENTING IS USED,
BOTH PIPES (INTAKE AND EXHAUST)
MUST BE REDUCED TO 2 Ø BEFORE
PENETRATING ROOF.
3" (8cm) MIN.
SEE DETAIL A
B
36"
ST-A1194-21
DETAIL A
12" (31cm) U.S.
36" MAX.
CANADA: TERMINATIONS
(91 cm)
MUST CONFORM TO
CSA B149.1-10, SECT. 8.14
NOTE: IF 3 Ø
VENTING IS USED,
BOTH PIPES (INTAKE
AND EXHAUST) MUST
BE REDUCED TO 2 Ø
BEFORE PENETRATING
ROOF.
ST-A1194-18
DETAIL
FIGURE 34
TWO FURNACE VENTING WITH CONCENTRIC VENTING
CONCENTRIC VENTING THROUGH ROOF
MINIMUM 12"/31cm IN
U.S. ABOVE AVERAGE
SNOW ACCUMULATION.
MAXIMUM OF 24"/61cm
ABOVE ROOF.*
CONCENTRIC VENTING THROUGH WALL
6' (1.8m) MINIMUM
10' (3m) RECOMMENDED
MINIMUM 12"/31cm* ABOVE
GRADE OR HIGHEST*
ANTICIPATED SNOW LEVEL
*CANADA: Termination must conform to CSA B149.1-10,
B
sect. 8.14
36"
For 2 Direct Vent Furnace Installations
B 1. Terminations must be 9-24" apart.
B
2. Canada: 12" (300mm) for inputs 10k Btuh (3kW) up to
B 2. Canada:
and including 100K Btuh (30kW)
B 2. Canada:
36" (900mm) for inputs exceeding 100K
B 2. Canada:
Btuh (30kW)
For 3 or More Direct Vent Furnace Installations
Furnace terminations require 36" between each additional
pair of terminations for US and Canada.
B
36"
ST-A1194-22
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