FC Safety Standards & Codes for Furnace Systems 4

Question 1

A technician finds a cracked heat exchanger in a gas furnace. According to industry safety standards, what is the REQUIRED action?

Accepted Answer

Tag the unit out of service and inform the owner immediately

Answer

A cracked heat exchanger allows combustion gases including CO to enter the air stream; the unit must be taken out of service immediately.

Question 2

What is the minimum required slope for a horizontal Category IV condensate drain line exiting a high-efficiency furnace?

Accepted Answer

1/4 inch per foot toward the drain

Answer

Condensate drain lines should slope a minimum of 1/4 inch per foot toward the drain to ensure proper condensate removal and prevent blockage.

Question 3

Under NFPA 54, what is the minimum required distance between the gas meter outlet and the furnace appliance connector when using a flexible corrugated metallic connector?

Accepted Answer

The connector must not extend through walls, floors, or ceilings

Answer

NFPA 54 prohibits flexible connectors from passing through walls, floors, or ceilings; they must be used only in exposed locations.

Question 4

Which NFPA standard specifically addresses the installation of oil-burning furnaces and related equipment?

Accepted Answer

NFPA 31

Answer

NFPA 31, Standard for the Installation of Oil-Burning Equipment, governs oil furnace installation requirements.

Question 5

According to the IMC, what is the minimum chimney height above the roof for a masonry chimney serving a gas furnace?

Accepted Answer

2 feet above the highest point within 10 feet horizontally

Answer

The IMC (and NFPA 211) requires chimney terminations to be at least 2 feet above any portion of the roof within 10 feet horizontally.

(FC) Furnace Installation and Maintenance Certification Practice Test

(FC) Furnace Installation and Maintenance Certification Practice Test

FC Safety Standards & Codes for Furnace Systems 4