MD HVAC MASTERS ACTUAL
EXAMINATION 2026 QUESTIONS WITH
VERIFIED ANSWERS GRADED A+
⫸ Minimum distance of gas fired appliance to be installed in a public
garage Answer: 8'
⫸ Minimum distance from the roof edge that will not require guard rail
when an appliance is installed which need roof hatch, provided that the
roof is 8ft from the grade level. Answer: 10'
⫸ Minimum clearance for all sides of a central warm air furnace to be
installed in a new construction Answer: 3"
⫸ Maximum horizontal hanger spacing for steel pipe in hydronic
system Answer: 12'
⫸ Equipment installed under floor shall have a minimum accessible are
of Answer: 22"X30"
⫸ Minimum depth of an auxiliary drain pain in a condensate disposal
Answer: 1.5"
⫸ Minimum distance between a return air opening of a furnace and an
appliance exhaust vent in the same building Answer: 10'
, ⫸ Minimum exhaust rate of residential bathroom with intermittent vent
Answer: 50cfm
⫸ Ventilation requirement for 3000sf crawl space Answer: 60cfm
⫸ Minimum exhaust rate of 35sf public bathroom with one lav and one
toilet Answer: 75cfm
⫸ Minimum exhaust rate of a theater lobby Answer: 1000cfm
⫸ Minimum exhaust rate of a 2000sf dry cleaning facility with Type II
system Answer: 2000cfm
⫸ When isntalling an exhaust duct for downflow domestic range hood,
what is required? Answer: Backdraft Damper
⫸ Minimum thickness of rigid duct penetrating a wall or ceiling
Answer: 26 gage
⫸ Gease duct can be sealed by Answer: Welded
⫸ Minimum slope of 80' horizontal duct Answer: 1 inch per foot
EXAMINATION 2026 QUESTIONS WITH
VERIFIED ANSWERS GRADED A+
⫸ Minimum distance of gas fired appliance to be installed in a public
garage Answer: 8'
⫸ Minimum distance from the roof edge that will not require guard rail
when an appliance is installed which need roof hatch, provided that the
roof is 8ft from the grade level. Answer: 10'
⫸ Minimum clearance for all sides of a central warm air furnace to be
installed in a new construction Answer: 3"
⫸ Maximum horizontal hanger spacing for steel pipe in hydronic
system Answer: 12'
⫸ Equipment installed under floor shall have a minimum accessible are
of Answer: 22"X30"
⫸ Minimum depth of an auxiliary drain pain in a condensate disposal
Answer: 1.5"
⫸ Minimum distance between a return air opening of a furnace and an
appliance exhaust vent in the same building Answer: 10'
, ⫸ Minimum exhaust rate of residential bathroom with intermittent vent
Answer: 50cfm
⫸ Ventilation requirement for 3000sf crawl space Answer: 60cfm
⫸ Minimum exhaust rate of 35sf public bathroom with one lav and one
toilet Answer: 75cfm
⫸ Minimum exhaust rate of a theater lobby Answer: 1000cfm
⫸ Minimum exhaust rate of a 2000sf dry cleaning facility with Type II
system Answer: 2000cfm
⫸ When isntalling an exhaust duct for downflow domestic range hood,
what is required? Answer: Backdraft Damper
⫸ Minimum thickness of rigid duct penetrating a wall or ceiling
Answer: 26 gage
⫸ Gease duct can be sealed by Answer: Welded
⫸ Minimum slope of 80' horizontal duct Answer: 1 inch per foot
