Under the 40 CFR Part 84 leak repair rule that took effect January 1, 2026, what trigger leak rate applies?

Leak repair requirements · EPA 608 Type II. The correct answer, and the reasoning behind it.

Leak-rate thresholds, repair deadlines, extensions and records.

The question

An office building's comfort-cooling chiller holds 300 pounds of R-134a, an HFC. Under the 40 CFR Part 84 leak repair rule that took effect January 1, 2026, what trigger leak rate applies?

• A10 percentCorrect answer
• B20 percent
• C30 percent
• DNo rate; HFC systems are not covered

Why “10 percent” is correct

From January 1, 2026, Part 84 leak repair applies to appliances of 15 pounds or more using an HFC with a global warming potential above 53, such as R-134a, outside the excluded residential and light commercial air conditioning and heat pump subsector. Its rates mirror Part 82: 10 percent for comfort cooling, 20 percent commercial, 30 percent industrial process.

Source: 40 CFR 84.106(a); 40 CFR 84.106(c); 40 CFR 84.102

Why the other answers are wrong

• 20 percent — 20 percent is the commercial refrigeration rate.
• 30 percent — 30 percent is the industrial process refrigeration rate.
• No rate; HFC systems are not covered — A 300-pound R-134a comfort-cooling chiller is covered by Part 84 from January 1, 2026.

Practice more of this

More EPA 608 Type II practice questions, or see every EPA 608 practice test.