Firman H08053 Owner's Manual page 26

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When operated above 77°F(25°C) there may be a decrease in power.
Maximum wattage and current are subject to and limited by such factors as fuel BTU content
ambient temperature, altitude, engine condition and etc. Maximum power decreases about 3.5%
for each 1,000 feet above sea level; and will also decrease about 1% for each 10°F(6°C) above
60°F(16°C) ambient temperature.
ADD ENGINE OIL
CAUTION
1.Place generator on a flat, level surface.
2.Clean area around oil fill and remove yellow oil
fill cap/dipstick.
3.Wipe dipstick clean.
English
Customer Service: 1-844-FIRMAN1Page 16