Honda WP20X, WP30X Owner's Manual page 7

PUMP SAFETY
Hot Exhaust
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler
while
it is
hot. Let the engine cool before transporting the pump or
storing it indoors.
To prevent fire hazards, keep the pump a t least 3 feet ( 1 meter) away
from building walls and other equipment during operation. Do not
place flammable objects close to the engine.
Carbon Monoxide Hazard
Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of
exhaust gas. Never run the engine in a closed garage or confined area.