if it uncovers an opening of more than how much flow area for more than how long?

Recovery requirements · EPA 608 Type III. The correct answer, and the reasoning behind it.

Evacuation levels for low-pressure appliances, and major versus non-major repairs.

The question

Apart from removing a major component, a repair is "major" if it uncovers an opening of more than how much flow area for more than how long?

• AMore than 2 square inches for more than 30 minutes
• BMore than 4 square inches for more than 60 minutes
• CMore than 10 square inches for more than 15 minutes
• DMore than 4 square inches for more than 15 minutesCorrect answer

Why “More than 4 square inches for more than 15 minutes” is correct

The definition in 40 CFR 82.152 treats any repair that uncovers more than 4 square inches of flow area for more than 15 minutes as major, even if no major component is removed. Both conditions must be met for the opening alone to make the repair major.

Source: 40 CFR 82.152

Why the other answers are wrong

• More than 2 square inches for more than 30 minutes — Both numbers are wrong; the regulation uses 4 square inches and 15 minutes.
• More than 4 square inches for more than 60 minutes — The time limit is 15 minutes, not an hour.
• More than 10 square inches for more than 15 minutes — The area threshold is 4 square inches, not 10.

Practice more of this

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