Install Instructions

107750-01 - 9/17

NOTICE

Do not exceed maximum vent/combustion air system length. Refer to Tables 7.1 and 7.13 in this

section for maximum vent/combustion air system length.

Use only vent and combustion air terminals and terminal locations shown in Tables 7.5, 7.13, and

7.21 and related Figures in this section.

4. Minimum Vent and Air Intake Lengths - Observe the minimum vent lengths shown in Tables 7.5, 7.13 and 7.21.

5. Clearances to Combustibles - Maintain the following clearances from the vent system to combustible construction:

• Vent - 1/4" (6mm) (also observe clearances through both combustible and non-combustible walls - see 9 below)

• Air Intake - 0"

• Concentric Portion of Concentric Terminals - 0"

6. Pitch of Horizontal Vent Piping - Pitch all horizontal vent piping so that any condensate which forms in the piping will run

towards the boiler.

• Pitch CPVC/PVC vent piping 1/4" per foot (21mm/m).

• Pitch PolyPropylene vent piping 5/8" per foot (53mm/m).

For Category I, II, and IV boilers, have horizontal runs sloping upwards not less than 1/4 inch per foot (21 mm/m) from the

boiler to the vent terminal.

Les chaudières de catégories I, II et IV doivent présenter des tronçons horizontaux dont la pente montante est d’au moins

1/4 po par pied (21 mm/m) entre la chaudière et l’évent.

VII. Venting A. Vent System Design (continued)

Table 7.1: Vent/ Air Intake Fitting Equivalent Length

Component Equivalent Length

Nominal Diameter 3 in. (80 mm) 4 in. (100 or 110 mm)

90° Elbow, Short Radius 10 ft. (3.0 m) 13 ft. (4.0 m)

90° Elbow, Long Sweep/Sanitary 4.0 ft. (1.2 m) 9 ft. (2.7 m)

45° Elbow 3.0 ft. (0.9 m) 4.5 ft. (1.4 m)

Figure 7.2: CPVC and PVC Elbows