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5
Installing vent & air piping
Do not insulate vent piping. Exception: Where vent pipes
pass through unheated spaces, such as crawl spaces or
unheated garages, apply ½ inch fiberglass insulation to
the portion of the vent pipe in the unheated space only.
When a large number of elbows is needed with 3-inch
piping, use long radius elbows to reduce pressure drop.
This allows a longer run of piping. See Table 2 notes for
details.
Figure 9
Part number 550-141-965/0703
-
GAS
FIRED WATER BOILER
Vent/air piping installation
— Vent Supplement
(continued)
Table 2
Min/max lengths of either air piping
or vent piping
Table replaced by addendum see next page
Figure 9a
Alternate piping arrangement using
(3) 45° street ells for closer pipe
centers
11
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