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2027 International Fuel Gas Code
Chapter 3

IFGC 2027

2027 International Fuel Gas Code

Chapter 3General Regulations

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Question 1 1.

Which code regulates combustion and dilution air requirements for appliances operating with fuels other than fuel gas?

NFPA 54
International Building Code
International Plumbing Code
International Mechanical Code

Question 2 2.

What standard or evaluation must serve as the basis for the code official approving an unlisted fuel gas appliance?

Prior performance history in similar occupancies
An approved engineering evaluation
Manufacturer certification under UL 1618
Field testing by the gas utility

Question 3 3.

Which information is required to appear on the permanent factory-applied nameplate affixed to a listed fuel gas appliance?

Total volume of combustion air required per hour
Maximum piping pressure drop and pipe diameter
Calculated efficiency percentage and venting category
Hourly rating in Btu/h, approved fuel gas type, and minimum clearances

Question 4 4.

Under what condition is an appliance permitted to be converted to utilize a different fuel gas?

Where the burner orifices are replaced with orifices of smaller diameter by a certified technician
Where complete instructions are provided in the installation instructions, by the gas supplier, or by the manufacturer
Where an engineering evaluation is submitted to the local utility provider for prior review
Where field testing verifies that carbon monoxide output does not exceed listing thresholds

Question 5 5.

A fuel gas-fired boiler installation includes a vibration isolation system. What additional provision is specifically mandated by the code?

An approved means for support and restraint of that appliance
Flexible metallic CSST connectors not exceeding 3 feet
A secondary automatic shutoff valve on the supply manifold
An elevated concrete housekeeping pad of not less than 6 inches

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