Empire Comfort Systems Mantis Instructions D'installation page 18

DIRECT VENT AND COLINEAR VENT EXAMPLES
Figure 18
In direct vent applications, the minimum distance between the two
pipes is three inches and the maximum distance is 24 inches. The
flue exhaust and air inlet can be terminated with either a PTrap or
two 90° elbows as shown in Figures 13 and 14.
Page 18
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Determining Minimum Vent Height Above the Roof
WARNING: Major U.S. building codes specify minimum chimney
and/or vent height above the rooftop. These minimum heights are
necessary in the interest of safety. These specifications are sum-
marized in Figure 19.
ROOF PITCH H (Min.)
Flat to 6/12 12" (305 mm)
6/12 to 7/12 15" (381 mm)
Over 7/12 to 8/12 18" (457 mm)
Over 8/12 to 16/12 24" (610 mm)
Over 16/12 to 21/12 36" (914 mm)
Colinear Direct Vent - Pitched Roof Installation
Figure 19
31793-3-1015