Multiventing Of Direct Vent Furnaces - Rheem R95P Installation Instructions Manual

GENERAL VENTING REQUIREMENTS AND
GUIDELINES
MULTIVENTING OF DIRECT-VENT FURNACES
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
TWO PIPE VENTING THROUGH ROOF
COMBUSTION
AIR INTAKE
2" PVC
SEE DETAIL
"A"
TWO PIPE VENTING THROUGH WALL
12"/31cm MIN. ABOVE
GRADE OR HIGHEST
8"/20cm
ANTICIPATED SNOW LEVEL.
CANADA: MUST CONFORM TO
MIN.
CSA B149.1-10, SECT. 8.14
DIRECT VENT VERTICAL TERMINATION DETAIL
*
*3" (8cm) minimum only if no snow accumulation is anticipated.
66
3"/8cm
MAX.
SEE
A
ST-A1194-22
ST-A1194-21
DETAIL A
12" (31cm) U.S.
CANADA: MUST CONFORM
TO CSA B149.1-10, SECT. 8.14
ST-A1194-18
DETAIL A
FIGURE 34
TWO FURNACE VENTING THROUGH WALL
CONCENTRIC VENTING THROUGH ROOF
SEE
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
CONCENTRIC VENTING THROUGH WALL
6' (1.8m) MINIMUM
10' (3m) RECOMMENDED
MINIMUM 12"/31cm
ABOVE GRADE
CANADA: TERMINATION
MUST CONFORM TO CSA
B149.1-10, SECT. 8-14
SEE
A
A
2 FURNACES
➀ Terminations must be greater than 8" apart.
Terminations must be less than 24" apart or greater than
36" apart.
3rd OR MORE FURNACES
Each additional termination must be greater than 48" from
the previous termination.
A
ST-A1194-22