General Venting Requirements And Guidelines; Equivalent Vent Length - Rheem 96P series Installation Instructions Manual

GENERAL VENTING REQUIREMENTS AND
VENT PIPE SIZING AND MAXIMUM VENT LENGTHS (cont.)
TABLE 4: MAXIMUM EQUIVALENT VENTY LENGTH
(TABLE IS FOR BOTH DIRECT & NON­DIRECT VENTING)
Input
Pipe Size
(BTU/H)
2 inchØ
42,000
3 inchØ
2 inchØ
56,000
3 inchØ
2 inchØ
70,000
3 inchØ
2 inchØ
84,000
3 inchØ
2 inchØ
98,000
3 inchØ
2 inchØ
112,000
3 inchØ
NOTE: The elbows needed for the vent termination are not counted in these lengths except at altitudes
above 6,000 feet. Above 6,000 feet alternate horizontal vent termination elbows are to be included in
the equivalent vent length.
* This is the recommended maximum number of long sweep elbows for either 2 or 3 inch pipe. Combi‐
nations of long sweep 90s, standard 90s, or 45s may be used, but the manufacturer recommends the
use of long
sweep 90s whenever possible because the use of the maximum number of standard 90 and 45 elbows
only may result in nuisance furnace outages due to individual installation specifics.
Exceeding the recommended maximum number of elbows may cause nuisance operation of the pressure
switch.
** Not applicable for alternate terminations.
Maximum Equivalent
Length (Feet)
65
100
65
100
65
100
30
100
20
100
20
85
Recommended
Maximum Number
of Elbows
6
6
6
6
6
6
2
6
2**
6
2**
6
GUIDELINES
49