Lochinvar EnergyRite ER302 - Manual (Page 10)

Installation & Operation Manual
10
1
Determine pool heater location
Figure 1-3_Combustion Air Through Ducts
2. 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.
Figure 1-4_Combustion Air from Interior Space
3. 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 of input, but not less than
100 square inches.
Figure 1-5_Combustion Air from Outside - Single
Opening
4. If a single combustion air opening is provided to bring
combustion air in directly from the outdoors, the
opening must be sized based on a minimum free area
of one square inch per 3000 Btu/hr. This opening must be
located within 12" of the top of the ceiling.