NHIE Prep – HVAC Questions and Answers 100% Correct

NHIE Prep – HVAC Questions and Answers 100% Correct The fill pipe for an underground oil tank is __ inches. 2 The duct size for a dryer vent is a minimum of __ inches. 4 __ feet is the maximum spacing between supports for horizontal non-metallic flex air ducts. 4 A furnace can be in a laundry room. T or F? True The hearth of a fireplace should extend __ inches in front if the opening is 6 feet, and __ inches in front if over 6 feet. 16, 20 There is a minimum __ inch separation between a chimney and combustibles. 2 Vents must terminate a minimum of 2 feet above and __ feet horizontal to a window or other opening. 10 Return ductwork is __% larger than supply ductwork. 30 A gas appliance vent through a roof requires a minimum clearance of __ feet. 2 AC condensate drain lines must be at least __ inches. 3/4 The minimum air gap on an evaporative cooler is __ inch(es). 1 A clothes dryer vent may pass through a ventilation duct. T or F? True Vent pipes shall not be less than ___ inches 1 1/4 Outside combustion air cannot be taken from an attic that has a height of less than __ inches. 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? True The minimum access opening for a gas meter is __x24 inches. 22 With an upright furnace in an attic, __ feet of headroom is required. 5 New furnaces (after Jan. 1992) must be at least __% efficient. 80 Workspace in front of a furnace must be __ inches deep in front. 30 It is alright to access a furnace through a broom closet, but it cannot be in a storage closet. T or F? True