Compensating For Restrictions; Testing The Installation.11 - Generac Power Systems NP Series Installation Manual

COMPENSATING FOR
RESTRiaiONS
Such materials as screening, louvers, or expanded
metal can restrict the free flow of air. Compensate for
this restriction by making the actual air opening pro¬
portionately larger.
Some materials may offer only a 60 percent "free air
inlet area." Other more efficient materials may provide
up to a 90 percent free air inlet area. The percentage
of free air inlet opening is usually available from the
material supplier or manufacturer.
TO DETERMINE THE ACTUAL AIR INLET OPEN¬
ING SIZE REQUIRED, DIVIDE 100 SQUARE INCH¬
ES BY THE PERCENTAGE OF FREE AIR INLET
AREA FOR THE MATERIAL YOU WILL USE.
For example: If you plan to use screening with an
80% free air inlet area, divide 100 by 0.8, which
results in 125 square inches. Minimum actual size of
air inlet opening in this case is 125 square inches. An
opening that measures 8 inches wide by 16 inches
long provides the required air flow (8 x 16 = 128
square inches).
TESTING THE INSTALLATION
Generac recommends testing the installation to be
sure adequate cooling air flow is available to the unit
before placing the unit into service. If the unit shows
signs of overheating, you will need to enlarge the air
openings. Never place a unit into service until
absolutely certain that cooling and ventilation is ade¬
quate.
IMPORTANT: YOU MUST TEST THE INSTALLA¬
TION ESPECIALLY IF YOU BRING IN AIR FROM
BELOW THE GENERATOR SET.
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