NHIE PREP – HVAC QUESTIONS AND ANSWERS
The fill pipe for an underground oil tank is __ inches. - Answers-2
The duct size for a dryer vent is a minimum of __ inches. - Answers-4
__ feet is the maximum spacing between supports for horizontal non-metallic flex air
ducts. - Answers-4
A furnace can be in a laundry room. T or F? - Answers-True
AC condensate drain lines must be at least __ inches. - Answers-3/4
The minimum air gap on an evaporative cooler is __ inch(es). - Answers-1
A clothes dryer vent may pass through a ventilation duct. T or F? - Answers-True
Vent pipes shall not be less than ___ inches - Answers-1 1/4
Outside combustion air cannot be taken from an attic that has a height of less than __
inches. - Answers-30
Outdoor air shall not be taken from within 10 feet of an appliance or plumbing vent that
is located less than 3 feet above the air inlet. T or F? - Answers-True
The minimum access opening for a gas meter is __x24 inches. - Answers-22
With an upright furnace in an attic, __ feet of headroom is required. - Answers-5
New furnaces (after Jan. 1992) must be at least __% efficient. - Answers-80
Workspace in front of a furnace must be __ inches deep in front. - Answers-30
It is alright to *access* a furnace through a broom closet, but it cannot be in a storage
closet. T or F? - Answers-True
A furnace must be suspended 6 inches minimum above grade when suspended, e.g. in
crawl space. T or F? - Answers-True
Vent ducts must be a minimum of __ inches above ground. - Answers-4
Attic furnace access door must be a minimum of __w x 30h inches. - Answers-22
__x__ inch platform in front of furnace firebox (control panel side). - Answers-30x30
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