Napoleon ULTIMATE 9700 Series Installation And Operating Instructions Manual page 65

7. Do not allow snow, ice or debris to accumulate around the outdoor furnace exhaust and combustion
air intake terminals. Blockage of the exhaust or combustion intake terminals can result in inadequate
performance or nuisance shut-downs.
8. Familiarize yourself with the location of your furnace fi lter or fi lters. A blocked air fi lter will reduce effi ciency,
increase fuel consumption, raise the furnace operating temperature, and shorten the life of furnace
components.
9. Do not cover return air grills and supply air registers with drapes, curtains, throw rugs, etc.
10. Avoid shutting off supply air registers in the interests of saving heat. While there is some validity to this
practice with space heating, there is little to be gained in central heating systems. The furnace requires
a quantity of air passing over the heat exchanger to operate within design temperatures. Reducing the
number of supply air registers available for air delivery may have the unforeseen consequence of raising
the furnace operating temperature, reducing furnace effi ciency, and shortening the life of the furnace
components.
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UM