Clearances To Combustibles; Pitch Of Horizontal Vent Piping; Vent/Air Intake Fitting Equivalent Length; Cpvc And Pvc Elbows - U.S. Boiler Company K2 Installation Instructions Manual

4. Minimum Vent and Air Intake Lengths - Observe the minimum vent lengths shown in Tables 7.1, 7.13 and 7.21.
5. Clearances to Combustibles - Maintain the following clearances from the vent system to combustible construction:
• Vent - 1/4" (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.
• Pitch Polypropylene vent piping 5/8" per foot.
Les chaudières de catégories I, II et IV doivent présenter des tronçons horizontaux dont la pente montante est d'au moins
5/8 po par pied (52 mm/m) entre la chaudière et l'évent.
Table 7.1: Vent/ Air Intake Fitting Equivalent Length
CPVC/PVC Fitting
2" 90° Elbow ("Sanitary Bend")
3" 90° Elbow ("Sanitary Bend")
2" 90° Elbow ("Short Bend" )
3" 90° Elbow ("Short Bend")
2" 45° Elbow
3" 45° Elbow
2" Coupling
3" Coupling
18
VII. Venting
A. Vent System Design (continued)
Equivalent Length (ft)
2.6
4.0
6.0
10.0
1.5
2.0
0.0
0.0
Figure 7.2: CPVC and PVC Elbows
PolyPro, Polyflue or InnoFlue
Vent Fitting
2" 90° Elbow
3" 90° Elbow
2" 90° Elbow
3" 45° Elbow
Equivalent Length (ft)
4.5
8.7
2.5
4.6
105294-05 - 5/15