Install Instructions

103448-08 - 9/16 21
IV. Venting A. General Guidelines (continued)
Table 5A: Vent and Combustion Air Pipe Sizes and Equivalent Lengths
(Applies to All Listed Vent/Combustion Air System Options)
Boiler
Model
Option
Combustion Air Length Vent Length
Pipe Dia., in.
(mm)
Min., ft.
(m)
Max., ft.
(m)
Pipe Dia., in.
(mm)
Min., ft.
(m)
Max., ft.
(m)
ALP080B
Reduced
Diameter
2 (60) 2.5 (0.76) 60 (18.3) 2 (60) 2.5 (0.76) 60 (18.3)
Factory Build 3 (80) 2.5 (0.76) 135 (41.1) 3 (80) 2.5 (0.76 135 (41.1)
ALP105B
Reduced
Diameter
2 (60) 2.5 (0.76) 60 (18.3) 2 (60) 2.5 (0.76) 60 (18.3)
Factory Build 3 (80) 2.5 (0.76) 135 (41.1) 3 (80) 2.5 (0.76) 135 (41.1)
ALP150B Factory Build 3 (80) 2.5 (0.76) 135 (41.1) 3 (80) 2.5 (0.76) 100 (30.5)
ALP210B Factory Build 3 (80) 2.5 (0.76) 135 (41.1) 3 (80) 2.5 (0.76) 135 (41.1)
ALP285B
Reduced
Diameter
3 (80) 2.5 (0.76) 60 (18.3) 3 (80) 2.5 (0.76) 60 (18.3)
Factory Build 4 (100 or 110) 2.5 (0.76) 100 (30.5) 4 (100 or 110) 2.5 (0.76) 100 (30.5)
Notes:
 Applicable to ALP080B (W) and ALP105B (W) builds for reduced 2” vent/air intake diameter option (60’ max. equivalent
vent length):
• Install factory provided 3” x 30” long pipe into vent elbow outlet inside air box assembly
• Mount installer provided 3” x 2” CPVC concentric reducing coupling or 3” x 2” PVC concentric reducing coupling, as
applicable (see paragraph 6 ‘Horizontal Sidewall Termination’ and Figure 12 ‘Wall Penetration Clearances for PVC
Pipe), in vertical position only, at pipe opposite end and install the balance of installer provided 2” CPVC or PVC vent
piping and supplied vent termination (coupling) with screen.
• To transition from 3” factory air intake to 2” air intake, attach installer provided short piece of 3” PVC pipe to boiler air
intake at air collar plate assembly.
• Mount installer provided 3” x 2” PVC concentric reducing coupling onto 3” PVC pipe and install the balance of
installer provided 2” PVC air intake piping and supplied air intake termination (90° elbow) with screen.
 Applicable to ALP080B (F) and ALP105B (F) builds for reduced 2” vent/air intake diameter option (60’ max. equivalent
vent length):
• Mount provided 3” x 30” long CPVC pipe and 3” 90° CPVC elbow into two-pipe vent/intake air system connector
assembly vent connection
• Mount installer provided 3” x 2” CPVC concentric reducing coupling or 3” x 2” PVC concentric reducing coupling, as
applicable (see paragraph 6 ‘Horizontal Sidewall Termination’ and Figure 12 ‘Wall Penetration Clearances for PVC
Pipe), in vertical position only, at pipe opposite end and install the balance of installer provided 2” CPVC or PVC vent
piping and supplied vent termination (coupling) with screen.
• Mount installer provided 3” PVC air intake pipe into two-pipe vent/intake air connector assembly air intake
connection.
• Mount provided 3” x 2” PVC concentric reducing coupling at pipe opposite end and install the balance of installer
provided 2” PVC air intake piping and supplied air intake termination (90° elbow) with screen.
 Applicable to ALP285B build for reduced 3” vent/air intake diameter option (60’ max. equivalent vent length):
• Mount provided 4” x 30” long CPVC pipe into two-pipe vent/intake air system connector assembly vent connection
and secure with built-in worm-drive clamp. The pipe may be cut to suit installation.
• Install 4” 90° CPVC elbow at the opposite end of the pipe. The elbow may be installed between pipe two cut pieces.
• Mount installer provided 4” x 3” CPVC concentric reducing coupling or 4” x 3” PVC concentric reducing coupling, as
applicable (see paragraph 6 ‘Horizontal Sidewall Termination’ and Figure 12 ‘Wall Penetration Clearances for PVC
Pipe), in vertical position only, at vent pipe end. Proceed to install the balance of installer provided 3” CPVC or PVC
vent piping and vent termination (coupling) with screen.
• Mount installer provided 4” PVC pipe into two-pipe vent/combustion air system connector assembly air intake
connection and secure with built-in worm-drive clamp.
• Mount installer provided 4” x 3” PVC concentric reducing coupling at air intake pipe end.
• Install the balance of installer provided 3” PVC air intake piping and air intake termination (90° elbow) with screen.
Table 5B: Vent System and Combustion Air System Component Equivalent Length
(Applies to All Listed Vent/Combustion Air System Options)
Component Equivalent Length
Nominal Diameter 2 in. (60 mm) 3 in. (80 mm) 4 in. (100 mm or 110 mm)
90° Elbow (Short Radius) 6.0 ft. (1.8 m) 10 ft. (3.0 m) 13 ft. (4.0 m)
90° Elbow, Long Sweep/Sanitary 2.6 ft. (0.79 m) 4.0 ft. (1.2 m) 9 ft. (2.7 m)
45° Elbow (Short Radius) 1.5 ft. (0.45 m) 3.0 ft. (0.9 m) 4.5 ft. (1.4 m)