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7.
In Canada, vents shall be certified to ULC S636, Standard for Type BH Gas
Venting Systems. IPEX System 636 PVC is certified to this standard.
8.
In Canada, the first three feet (900 mm) of the vent must be readily
accessible for inspection.
9.
Minimum vent length for all models is 5 feet.
For single pipe systems it is recommended to install the combustion
air coupling provided and install approximately 18" of pipe on the
furnace. In addition to the vent/flue pipe, a single 90° elbow should be
secured to the combustion air intake to prevent inadvertent blockage.
Model Input - kBTU/H (kW)
Pipe Size - Inches (cm)
60 (17.6)
60 (17.6)
80 (23.4)
80 (23.4)
100 (29.3)
100 (29.3)
120 (35.1)
120 (35.1)
Table 6
Maximum Equivalent Pipe Length
A
STANDARD ELBOW
Figure 23
Elbow
2" Standard
3" Standard
2" Sweep
3" Sweep
Table 7
Elbow Dimensions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
Maximum Equivalent
Length - Feet (m)
2 (5.1)
60 (18.2)
3 (7.6)
90 (27.4)
2 (5.1)
60 (18.2)
3 (7.6)
90 (27.4)
2 (5.1)
30 (9.1)
3 (7.6)
90 (27.4)
2 (5.1)
N/A
3 (7.6)
90 (27.4)
A
LONG (SWEEP) ELBOW
"A" Dimension
2-5/16"
3-1/16"
3-1/4"
4-1/16"
Fitting
2" 90º sweep elbow
2" 45º sweep elbow
2" 90º standard elbow
2" 45º standard elbow
3" 90º sweep elbow
3" 45º sweep elbow
3" 90º standard elbow
3" 45º standard elbow
2" corrugated connector
3" corrugated connector
Table 8
Equivalent Length of Fittings
Example:
An 80,000 BTUH furnace requires 32 feet of pipe and four 90º elbows. Using 2"
pipe and standard elbows, the total equivalent length will be:
32 feet of 2" pipe =
4 - 90º standard 2" elbows =
Total =
This exceeds the 60 foot maximum equi valent length of 2" pipe allowed for that
model and is thus not acceptable.
By using sweep elbows, the total equivalent length will be:
32 feet of 2" pipe =
4 - 90º sweep 2" elbows =
Total =
This is less than the 60 foot maximum equivalent length of 2" pipe allowed for that
model and is thus acceptable.
Alternatively, using 3" pipe and standard elbows, the total equivalent length will be:
32 feet of 3" pipe =
4 - 90º standard 3" elbows =
Total =
This is less than the 90 foot maximum equivalent length of 3" pipe allowed for that
model and is thus acceptable.
Connection Type
Intake Pipe
Vent Pipe
Table 9
Combustion Air Intake & Vent Connection Size (All Models)
Furnace vent pipe connections are sized for 2" (5.1 cm). pipe. Any pipe
size change must be made outside the furnace cabinet in a vertical pipe
section to allow proper drainage of condensate. An offset using two 45º
(degree) elbows will be required for plenum clearance when the vent is
increased to 3" (7.6 cm).
Installation Instructions
Equivalent Length
5 feet of 2" pipe
2-1/2 feet of 2" pipe
10 feet of 2" pipe
5 feet of 2" pipe
5 feet of 3" pipe
2-1/2 feet of 3" pipe
10 feet of 3" pipe
5 feet of 3" pipe
10 feet of 2" pipe
10 feet of 3" pipe
32 equivalent feet
(4x10) = 40 equivalent feet
72 equivalent feet of 2" pipe
32 equivalent feet
(4x5) = 20 equivalent feet
52 equivalent feet of 2" pipe
32 equivalent feet
(4x10))= 40 equivalent feet
72 equivalent feet of 3" pipe
Size - Inches (cm)
2" (5.1)
2" (5.1)
| 27
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