HVAC Code Compliance 2

Question 1

According to the International Mechanical Code, what is the minimum clearance required between a gas-fired furnace and combustible materials on the sides?

Accepted Answer

1 inch

Answer

The IMC and manufacturer listings typically require a minimum 1-inch clearance on sides for listed furnaces unless the listing specifies otherwise.

Question 2

Which ASHRAE standard establishes minimum ventilation rates for acceptable indoor air quality in commercial buildings?

Accepted Answer

ASHRAE 62.1

Answer

ASHRAE Standard 62.1 specifies minimum ventilation rates and other measures to provide acceptable indoor air quality in commercial and institutional buildings.

Question 3

Under NFPA 54 (National Fuel Gas Code), what is the minimum pipe thread engagement required for a 1/2-inch gas pipe connection?

Accepted Answer

5 threads

Answer

NFPA 54 requires a minimum of 5 threads of engagement for a 1/2-inch pipe to ensure a leak-free gas connection.

Question 4

When installing a rooftop HVAC unit in a seismic design category D zone, which additional requirement applies per the International Mechanical Code?

Accepted Answer

Seismic bracing and anchorage

Answer

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.

Question 5

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?

Accepted Answer

100 cubic feet per 1,000 BTU/hr

Answer

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.

HVAC Practice Test

HVAC Practice Test

HVAC Code Compliance 2