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6) Permitted Terminals for Vertical Venting -
• Vent Option 5 - A straight termination is installed in the end of the vent pipe. Vent manufacturer part numbers for these
screens are shown in Table 7.5. The air inlet terminal consists of a 180 degree elbow (or two 90 degree elbows) with a
rodent screen as shown in Figure 7.10.
• Vent Option 6 - Use Crown PN 230532 with the appropriate flashing (Table 7.4b)
7) Vertical Vent Terminal Locations (Vent Options 5,6) - Observe the following limitations on the location of all vertical vent
terminals (see Figures 7.10, 7.11):
• The top of the vent pipe must be at least 2 feet above any object located within 10 feet.
• For Vent Option #5, the vertical distance between top of the vent and air inlet terminal openings must be at least 12”.
• 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 #6 has a fixed 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.
• For Vent Option #5, the air intake terminal must be located on the roof and must be no further than 24” horizontally from
the exhaust pipe.
8) Wall thimbles – Wall thimbles are required where single wall vent pipe passes through combustible walls with less than
the required clearance shown in Table 4.2 or as required by local codes. Stainless vent manufacturer’s wall thimble part
numbers are shown in Table 7.5. Note that concentric vent has a “zero” clearance to combustibles and therefore does not
require the use of wall thimbles.
TABLE 7.5: PERMISSIBLE STAINLESS STEEL VENT SYSTEMS
AND PRINCIPLE VENT COMPONENTS
(VENT OPTIONS 2, 5)
MANUFACTURER
VENT
SYSTEM
SIZE COMPONENT PART NUMBER
HEAT FAB
SAF-T
VENT
EZ SEAL
3 BOILER COLLAR CROWN 230510
3 WALL THIMBLE HEAT FAB 7393, 7393GCS, 5391CI
3 HORIZONTAL TERMINAL CROWN 230511
3 VERTICAL TERMINAL HEAT FAB 9392
PROTECH
SYSTEMS
INC.
FASNSEAL
3 BOILER COLLAR CROWN 230510
3 WALL THIMBLE FSWT3
3 HORIZONTAL TERMINAL CROWN 230511
3 VERTICAL TERMINAL FSBS3
Z-FLEX
SVE
SERIES III
(“Z-VENT
III”)
3 BOILER COLLAR CROWN 230510
3 WALL THIMBLE 2SVSWTEF03
3 HORIZONTAL TERMINAL CROWN 230511
3 VERTICAL TERMINAL 24SVSTPF03
METAL-FAB
CORR/
GUARD
3 BOILER COLLAR CROWN 230510
3 WALL THIMBLE CGSWWPK(3”)
3 HORIZONTAL TERMINAL CROWN 230511
3 VERTICAL TERMINAL CGSWHTM(3”)
NOTES:
1) See vent system manufacturer’s literature for other part numbers that are required such as straight pipe, elbows, firestops and vent supports.
2) Crown 230510 collar replaces factory-mounted concentric collar (Figure 7.16).
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