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Permitted Terminals for Vertical Venting6) - Use Crown PN 230532 with the appropriate ashing (Table 7.3b)
Vertical Vent Terminal Locations (Vent Option 5)7) - Observe the following limitations on the location of all
vertical vent terminals (see Figure 7.7):
The top of the vent pipe must be at least 2 feet above any object located within 10 feet.•
The bottom of the air inlet terminal must be at least 12” above the normal snow accumulation that can be •
expected on the roof. The terminal used in Vent Option #5 has a xed distance above the storm collar of
19”. If a greater distance is needed to provide the clearance above the snow line, build a chase on the
roof and mount the vertical terminal on top of the chase.
Wall thimbles8) – Concentric vent has a “zero” clearance to combustibles and therefore does not require the
use of wall thimbles.
Pitch of Horizontal Piping9) - Pitch all horizontal piping so that any condensate which forms in the piping will run
towards the boiler. Pitch Crown horizontal concentric venting 5/8” per foot
Supporting Pipe10) - Vertical and horizontal sections of pipe must be properly supported. Support Crown
concentric venting near the female end of each straight section of pipe. Exception: Vertical runs of concentric
pipe in an unused chimney (Figure 7.36) need only be supported at the terminal and at the base of the run.
VENT FITTING EQUIVALENT LENGTH (ft)
60/100mm 90° CONCENTRIC ELBOW 4.5
60/100mm 45° CONCENTRIC ELBOW 4.0
80/125mm 90° CONCENTRIC ELBOW 8.5
80/125mm 90° SWEEP CONCENTRIC ELBOW 5.5
80/125mm 45° CONCENTRIC ELBOW 3.0
80/125mm 90° CONCENTRIC SUPPORT ELBOW 8.5
VENT OPTION # 5 6
CLASSIFICATION USED IN THIS
MANUAL
VERTICAL
CONCENTRIC
RESERVED FOR
FUTURE USE
ILLUSTRATED IN FIGURE 7.7
VENT PIPE PENETRATION
THROUGH STRUCTURE
ROOF
VENT PIPE SIZE
80/125mm
CONCENTRIC
INLET AIR ORIFICE SIZE
82mm
MAX. VENT LENGTH
27ft - 10in
MIN. VENT LENGTH
6in
VENT TERMINAL
CROWN #230532
CONCENTRIC
TERMINAL (TABLE
7.3b)
VENT MATERIAL
CROWN 80/125 mm
VENT COMPONENTS
SHOWN IN TABLE
7.3b