Lochinvar 000 - 2 - Manual (Page 11)

You must locate the air inlet termination elbow at least 12"
(30cm) above the roof or above normal snow levels.
Keep the vent cap clear of snow, ice, leaves, and debris to
avoid blocking the flue.
Figure 10 - Vent Termination from Peaked Roof - 10' or
Less From Ridge
IMPORTANT: Vent terminations are not shown in
Figures 10, 11, 12, and 13. Make sure all vertical
vents are installed with vent terminations
recommended by the vent manufacturer.
Figure 11 - Vent Termination from Peaked Roof More Than
10' From Ridge
Figure 12 - Vent Termination from Flat Roof 10' or Less from
Parapet Wall
Figure 13 - Vent Termination from Flat Roof More Than 10'
from Parapet Wall
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CAUTION: Units which are shut down or
will not operate may experience freezing due to
convective air flow in the flue pipe, through the
air inlet, or from negative pressure in the
mechanical room. In cold climates, operate pump
continuously to help prevent freezing of boiler
water. Provide proper freeze protection. See
Freeze Protection, page 7.
TABLE-A
Flue Pipe Sizes
Installation and
Service Manual
11