Lochinvar Power-Fin Designer's Manual page 6

Designer's Guide / Power-fin Water Heater
1. COMBUSTION AIR FROM OUTSIDE
If air is taken directly from outside the building with no
duct, provide two permanent openings to the
equipment room:
(a) Combustion air opening, with a minimum free area
of one square inch per 4000 Btu/hr input (5.5 cm² per
kW). This opening must be located within 12" (30 cm)
of the bottom of the enclosure.
(b) Ventilation air opening, with a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm² per
kW). This opening must be located within 12" (30 cm)
of the top of the enclosure.
Did you Know?
THE POWER-FIN COMES WITH LOUVER CONTACTS AS STANDARD EQUIPMENT. THE CONTACTS
WILL OPEN AND CLOSE A MOTORIZED LOUVER ON EACH CALL FOR
3. COMBUSTION AIR FROM INTERIOR
SPACE
If air is taken from another interior space,
each of the two openings specified above
should have a net free area of one square
inch for each 1000 Btu/hr (22 cm² per kW) of
input, but not less than 100 square inches
(645 cm²).
2. COMBUSTION AIR THROUGH DUCTS
If combustion and ventilation air is taken from the outdoors using
a duct to deliver the air to the equipment room, each of the two
openings should be sized based on a minimum free area of one
square inch per 2000 Btu/hr (11 cm² per kW) of input.
6
LOCHINVAR CORPORATION
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com
HEAT.