MD HVAC MASTERS EXAM PREP
QUESTIONS AND ANSWERS FULL
SOLUTION
●● Size mesh screen for intake vents
Answer: '4 - 1''.
●● Psychometric chart
Answer: Used for relative and specific humidity.
●● Maximum length for flexible ducts
Answer: Unlimited.
●● Electrical code for commercial garage electric heaters
Answer: NFPA 301.10.
●● Mesh size for vents for fuel oil
Answer: # 4.
●● Attic mechanical ventilation
Answer: Not required when mechanical ventilation is present.
,●● CFM per ton
Answer: 400 CFM.
●● Fuel oil relief valves
Answer: Needed when pressure exceeds the limitations of the system.
●● Boiler walkways
Answer: Needed when size is 19 inches.
●● Clearance above a boiler with a manhole
Answer: 3 Ft.
●● Standard for hydronic piping insulation
Answer: In accordance with ASTM 884.
●● Safety interlocks for boilers
Answer: Low water cut-off.
●● Boiler high limit control
Answer: Automatically shuts off fuel supply if pressure gets too high.
, ●● Minimum gauge for type 1 commercial kitchen hoods
Answer: 20 gauge.
●● Clearance from a window/door for fuel lines
Answer: Not less than 2 feet from building opening.
●● Inlet and outlet size of a safety relief valve
Answer: Not smaller than the diameter of the outlet of the valve.
●● Minimum height of a heater in a commercial garage
Answer: 8 feet.
●● Type of pump needed for fuel oil
Answer: Positive displacement.
●● When steel piping can be used for fuel oil
Answer: 2018 chapter.
●● Canopy hoods minimum overhang
Answer: Less than 6 inches.
●● Non-canopy hood clearance above equipment
QUESTIONS AND ANSWERS FULL
SOLUTION
●● Size mesh screen for intake vents
Answer: '4 - 1''.
●● Psychometric chart
Answer: Used for relative and specific humidity.
●● Maximum length for flexible ducts
Answer: Unlimited.
●● Electrical code for commercial garage electric heaters
Answer: NFPA 301.10.
●● Mesh size for vents for fuel oil
Answer: # 4.
●● Attic mechanical ventilation
Answer: Not required when mechanical ventilation is present.
,●● CFM per ton
Answer: 400 CFM.
●● Fuel oil relief valves
Answer: Needed when pressure exceeds the limitations of the system.
●● Boiler walkways
Answer: Needed when size is 19 inches.
●● Clearance above a boiler with a manhole
Answer: 3 Ft.
●● Standard for hydronic piping insulation
Answer: In accordance with ASTM 884.
●● Safety interlocks for boilers
Answer: Low water cut-off.
●● Boiler high limit control
Answer: Automatically shuts off fuel supply if pressure gets too high.
, ●● Minimum gauge for type 1 commercial kitchen hoods
Answer: 20 gauge.
●● Clearance from a window/door for fuel lines
Answer: Not less than 2 feet from building opening.
●● Inlet and outlet size of a safety relief valve
Answer: Not smaller than the diameter of the outlet of the valve.
●● Minimum height of a heater in a commercial garage
Answer: 8 feet.
●● Type of pump needed for fuel oil
Answer: Positive displacement.
●● When steel piping can be used for fuel oil
Answer: 2018 chapter.
●● Canopy hoods minimum overhang
Answer: Less than 6 inches.
●● Non-canopy hood clearance above equipment
