Prescott Series Installation and Operation Manual
Page
15
b.
With
Outside Air Connected to the unit. In this manner the appliance is a Direct Vent
Appliance (sealed Combustion System) as listed in NFPA 211-6.
3.3.3.2 Direct Vent Appliance (Sealed Combustion System Appliance) A system consisting of an
appliance, combustion air and flue gas connections between the appliance and the outside
atmosphere, and a vent cap supplied by the manufacturer, and constructed so that all the air for
combustion is obtained from the outside atmosphere and all flue gases are discharged to the
outside atmosphere.
Special Venting Arrangements are listed in NFPA 211-31
10.7.1.2 The Vent Terminal of a Direct Vent Appliance with an input of 10000 BTU/Hr or less
shall be located at least 6” from any opening into a building, and such an appliance with an
input of over 10000 BTU/Hr, but not over 50000 BTU/Hr shall not be located less than 9” from
any opening through which vent gases could enter a building, and the vent terminal of such
appliance with an input over 50000 BTU/Hr shall be located not less than 12” from the opening.
Figure 5
9” (229 mm) ABOVE, BELOW OR HORIZONTALLY FROM a door, window, cavity, or air vent.