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A commercial refrigeration system with 500+ lb exceeds its leak rate. How often are leak inspections required?

Quarterly, until four quarters in a row stay under the rate.

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  1. Once per calendar year
  2. Once every six months
  3. Once every three months ✔

Why: Commercial and industrial process systems with a full charge of 500 pounds or more need leak inspections every three months. They continue until leak rate calculations show no excess for four quarters in a row.

Huh, didn't know that: Commercial and industrial systems of 50 to 499 pounds, and comfort cooling, need yearly inspections until a full year passes below the rate.

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Astronomers got tired of watching the moon go around the earth for 24 hours. They decided to call it a day.
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References

Answer: Once every three months. Commercial and industrial process systems with a full charge of 500 pounds or more need leak inspections every three months. They continue until leak rate calculations show no excess for four quarters in a row.

  1. 40 CFR 82.157 Appliance maintenance and leak repair (Cornell LII) www.law.cornell.edu/cfr/text/40/82.157
    leak inspections must be conducted once every three months until the owner or operator can demonstrate
    Checked 2026-10-10.
  2. 40 CFR 82.157 Appliance maintenance and leak repair (Cornell LII) www.law.cornell.edu/cfr/text/40/82.157
    Quarterly or annual leak inspections are not required on appliances
    Checked 2026-10-10.

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