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SESK: Stuff Everyone Should Know · sesk.info/epa-small-appliance-four-inch-vacuum

Instead of recovering a percentage, a technician can evacuate a small appliance to what vacuum?

Four inches of mercury vacuum is the alternative.

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  1. Four inches of mercury ✔
  2. Ten inches of mercury
  3. Twenty-nine inches of mercury

Why: EPA lets you meet the small appliance rule by recovering the required percentage or by pulling the appliance down to four inches of mercury vacuum. It is the easy option when you have a reliable gauge.

Huh, didn't know that: Older small-appliance recovery equipment, made before November 15, 1993, is also considered certified if it can pull a four-inch vacuum.

The dad joke
What did the broom say to the vacuum? I'm so tired of people pushing us around.
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References

Answer: Four inches of mercury. EPA lets you meet the small appliance rule by recovering the required percentage or by pulling the appliance down to four inches of mercury vacuum. It is the easy option when you have a reliable gauge.

  1. 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
    Evacuate the appliance to four inches of mercury vacuum
    Checked 2026-10-10.

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Trades & ShopMedium-pressure appliance under 200 lb, recovery equipment made after November 15, 1993. Evacuate to how many inches of mercury vacuum?Trades & ShopOpening a high-pressure appliance with under 200 lb, using post-1993 equipment. Evacuate to how many inches of mercury vacuum?Trades & ShopHigh-pressure appliance with 200 lb or more, post-1993 recovery equipment. Evacuate to how many inches of mercury vacuum?

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