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ECHO
Wind flow over roof structures can often cause localized pressure disturbances. Vent termination must take into
account these disturbances and minimize them by using the following table to maintain the correct legal height
of the vent.
NOTE: If your installation involves a roof with a slope greater than 6/12 or if a wall or other vertical obstruction
is within 8' of the vent termination, the vent termination will have to be taller in accordance with the following
table.
FIGURE 16– VENT TERMINATION
Roof Pitch
Flat to 6/12 ................................... 1.0
Over 6/12 to 7/12 ....................... 1.25
Over 7/12 to 8/12 ......................... 1.5
Over 8/12 to 9/12 ......................... 2.0
Over 9/12 to 10/12 ....................... 2.5
Over 10/12 to 11/12 ................... 3.25
Over 11/12 to 12/12 ..................... 4.0
Over 12/12 to 14/12 ..................... 5.0
Over 14/12 to 16/12 ..................... 6.0
Over 16/12 to 18/12 ..................... 7.0
Over 18/12 to 20/12 ..................... 7.5
Over 20/12 to 21/12 ..................... 8.0
24
DIRECT VENT GAS HEATER
H (Min.) Ft.
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