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Figure 15. Vertical Category IV venting through a roof
Figure 16. Vertical Category IV venting up an existing
chimney
3048 mm
(10 FT.)
OR LESS
3048 mm
(10 FT.) MAX.
3048 mm
(10 FT.)
OR LESS
305 mm (1 FT.) MIN.
305 mm
(1 FT.)
MAX.
610 mm (2 FT.) MIN.
152 mm (6”)
MIN. CLEARANCE
20 mm/m
(1/4” PER FT.)
20 mm/m
(1/4” PER FT.)
VERTICAL CATEGORY IV VENTING
All Prodigy 21 boiler models are certified for vertical
Category IV venting through a roof provided the following conditions are met:
1. For roof passage of vent piping, a UL listed roof
flashing must be used.
2. The vent piping must terminate with a screened tee,
elbow, straight, or cap termination at the minimum
distance from the roof shown in Figure 15.
Figure 17. Horizontal Category IV venting through
outside wall
102 mm
(4”)MIN.
305 mm
(1 FT.)
MIN.
20 mm/m
(1/4” PER FT.)
12
All Prodigy 21 boiler models are certified for vertical
Category IV venting up an existing chimney provided
the following conditions are met:
1. To utilize an existing chimney as a chase, the vent
pipe must extend the total length of the chimney.
The top of the chimney must be sealed off around
the protruding pipe with an appropriate plate or
flashing.
2. The vent piping must terminate with a screened tee,
elbow, straight or cap termination at the minimum
distance from the roof shown in Figure 16.
3. Other appliances CANNOT be vented into the same
chimney or vent pipe within the chimney.
HORIZONTAL CATEGORY IV VENTING
All Prodigy 21 boiler models are certified for horizontal
Category IV venting provided the following conditions
are met:
1. For combustible wall passage of vent piping, a UL
listed thimble must be used, providing the wall
thickness is 102 mm (4") minimum to 305 mm (12")
maximum.
2. The venting piping must terminate with a screened
tee, elbow, or straight termination at the minimum
distance from the outside wall shown in Figure 17.