Code Compliance Flashcards
7 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Code Compliance flashcards as text
According to the International Mechanical Code, what is the minimum clearance required between a gas-fired furnace and combustible materials on the sides?
Answer: 1 inch
The IMC and manufacturer listings typically require a minimum 1-inch clearance on sides for listed furnaces unless the listing specifies otherwise.
Which ASHRAE standard establishes minimum ventilation rates for acceptable indoor air quality in commercial buildings?
Answer: ASHRAE 62.1
ASHRAE Standard 62.1 specifies minimum ventilation rates and other measures to provide acceptable indoor air quality in commercial and institutional buildings.
Under NFPA 54 (National Fuel Gas Code), what is the minimum pipe thread engagement required for a 1/2-inch gas pipe connection?
Answer: 5 threads
NFPA 54 requires a minimum of 5 threads of engagement for a 1/2-inch pipe to ensure a leak-free gas connection.
When installing a rooftop HVAC unit in a seismic design category D zone, which additional requirement applies per the International Mechanical Code?
Answer: Seismic bracing and anchorage
The IMC requires that mechanical equipment in high seismic zones be anchored and braced to resist seismic forces as specified in the International Building Code.
Per code, a mechanical room housing a gas-fired boiler must have combustion air openings sized to provide how many cubic feet of volume per BTU/hr of input for confined spaces?
Answer: 100 cubic feet per 1,000 BTU/hr
The standard rule requires at least 50 cubic feet per 1,000 BTU/hr of combined input for all appliances in a confined space using indoor air for combustion.
Which code section governs the use of flexible gas connectors for gas appliances in the United States?
Answer: ANSI Z21.24
ANSI Z21.24 covers flexible connectors for gas appliances, specifying requirements for materials, construction, pressure ratings, and testing.
Under the International Mechanical Code, what is the maximum length allowed for a single-wall metal exhaust duct serving a clothes dryer?
Answer: 25 feet
The IMC allows a maximum of 25 feet for a dryer exhaust duct, with reductions in length required for each 90-degree elbow installed.