ProSelect Force Steam Gas Boiler Installation Manual

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FIGURE 4: VENT DAMPER INSTALLATION DETAILS
VI. Venting (continued)
Listed
cap
Listed
gas vent
H (minimum) -
Minimum height from roof
to lowest discharge opening
Roof pitch is x/12
12
x
Lowest discharge opening
FIGURE 5: TERMINATION LOCATIONS FOR GAS VENTS
WITH LISTED CAPS AT LEAST 8 FT (2.4 M)
FROM A VERTICAL WALL:
Roof Slope H (minimum)
ft m
Flat to 6/12 1.0 0.30
Over 6/12 to 7/12 1.25 0.38
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2.0 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4.0 1.22
Over 12/12 to 14/12 5.0 1.52
Over 14/12 to 16/12 6.0 1.83
Over 16/12 to 18/12 7.0 2.13
Over 18/12 to 20/12 7.5 2.27
Over 20/12 to 21/12 8.0 2.44
TABLE 2: ROOF SLOPE HEIGHTS