EPA 608 Type III · Dehydration & Evacuation · Medium
The Type III evacuation level of 25 mm Hg absolute equals about how many microns?
Answer: C. 25,000 microns.
- A2,500 microns.
- B250 microns.
- C25,000 microns.✓ Correct
- D500 microns.
Why C is right
1 mm Hg equals 1,000 microns, so 25 mm Hg absolute is about 25,000 microns. That is the recovery level; an evacuation to dehydrate a system before charging goes much deeper.
More Type III questions
- Why is a low-pressure chiller introduced with refrigerant vapor before liquid refrigerant during the charging process?
- Before charging liquid into a chiller, what must the system pressure be?
- Why must low-pressure chillers be designed to be completely airtight?
- R-123 is rated B1 under ASHRAE 34. What does that mean?
- Which HCFO refrigerant is replacing R-123 in new low-pressure chillers?
Go deeper with the study guide EPA 608 Evacuation Levels: The Required Vacuum by Appliance, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.