What does the technician normally do when installing a gas vent on a rooftop packaged unit?
A) The manufacturer-supplied hood is screwed onto the unit.
B) A vent hood is needed only if the unit is installed inside.
C) An approved single-wall vent is piped at least 3 ft above the top of the unit.
D) An approved double-wall vent is piped away from the unit to the side of the roof.
A
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