Rheem R95P - Multiventing of Direct Vent Furnaces

66
Venting
MULTIVENTING OF DIRECT-VENT FURNACES
GENERAL VENTING REQUIREMENTS AND
GUIDELINES
Figures 33 & 34: IF VENTING OF 2 OR MORE FURNACES NEAR EACH OTHER IS REQUIRED, EACH FURNACE
MUST BE INDIVIDUALLY VENTED – NO COMMON VENTING IS PERMITTED. See Figures 33 & 34 for positioning of
the terminations. When more than two furnaces are to be vented, there must be at least 4 feet between the first two fur-
naces 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 THROUGH ROOF
FIGURE 34
TWO FURNACE VENTING THROUGH WALL
3”/8cm
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
MINIMUM 12”/31cm IN U.S. ABOVE
AVERAGE SNOW ACCUMULATION.
MAXIMUM OF 24”/61cm ABOVE
ROOF. CANADA:
TERMINATION MUST
CONFORM TO CSA B-149.1-10, SECT. 8.14
A
SEE
*
12” (31cm) U.S.
CANADA: MUST CONFORM
TO CSA B149.1-10, SECT. 8.14
6’ (1.8m) MINIMUM
10’ (3m) RECOMMENDED
A
SEE
MINIMUM 12”/31cm
ABOVE GRADE
CANADA: TERMINATION
MUST CONFORM TO CSA
B149.1-10, SECT. 8-14
ST-A1194-18
DETAIL A
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.
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