Thermo Pride Gas/Propane Furnace Mobile Home CMC1 - Manual (Page 27)

All installations and services must be performed by qualified service personnel.
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b. The bottom edge of the vent termination elbow must be installed at
least 12-inches above the outlet of intake termination elbow.
c. The horizontal distance between the inlet and exhaust terminations
should be minimized, when possible, and should never exceed 24-
inches.
d. The vent and intake systems should utilize the same numbers of
elbows and approximately the same length of straight pipe to reach the
outside termination.
Figure 8: Typical Relative Locations of Direct Vent Terminations When
Sidewall Venting
3. Exhaust Vent Terminal Location Clearance Requirements
a. The vent terminal shall be located at least 3-feet above any forced air
inlet located within 10-feet. Refer to Figure 9 for a depiction of the
minimum required clearances between vent terminations and building
features according to the National Fuel Gas Code (NFGC).
b. The vent terminal shall be at least 12-inches below, 12-inches
horizontally from, or 12-inches above, any door, window, or gravity air
inlet into a building. The bottom of the vent terminal shall be located at
least 12-inches above grade.
c. The vent terminal shall not be located:
•
over public walkways or over an area where wetting of surfaces by
condensate, or water vapor, could create a nuisance or hazard,
•
near soffit vents, crawl space vents, or other areas where
condensate or water vapor could create a nuisance, hazard, or
cause property damage, and