UTICA BOILERS UCS-240 Installation, Operation & Maintenance Manual page 25

FIGURE 6-5 - Maximum Equivalent Length
Maximum Length = L
A B
C D
E F
G
H
FIGURE 6-6 (A-H)
D. Concentric Vent Screw Placement - See Figure 6.7
Fasten two screws through outer intake pipe behind the
gaskets at equal distances approx. 180º apart.
Note - screws used must be no larger than No.8 - 1/2" sheet
metal screws and must be zinc coated. Length of this screw
must be 0.75 in (19.00 mm).
When connecting vent pipes use only a small amount of
silicone grease supplied with the exhaust pipes. Do not use
other types of grease.
FIGURE 6-7 - Concentric Vent Screw Placement
6 - COMBUSTION AIR AND VENT PIPING
21' (6.4 m)
17' 8" (5.4 m)
21' (6.4 m)
14' 5" (4.4 m)
17'8" (5.4 m)
Before securing screws, verify pipe is pushed in
Note
a minimum of 1 ¾" (45mm) into gasketed end of
the other pipe.
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P/N 240011654, Rev. C [06/08/2017]