Weil-McLain ULTRA Ultra-105 Supplemental Manual page 12

5
Installing vent & air piping
Table 2
Figure 9
12
-
GAS FIRED WATER BOILER
Min/max lengths of either air piping
or vent piping
Piping to sidewall terminations
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.
— Vent Supplement
(continued)
Figure 10 Piping to through-roof terminations
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.
Part number 550-101-235/0903