A pressure below atmospheric pressure. A perfect vacuum is 30 inches of mercury (periodic symbol “Hg”)
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Licenses
- MD HVACR: #90754
- A.A. CO. HVACR #D1005953
- HARFORD CO. HVACR #000350-2022
- MD MHIC #05-148653
- MD PLB & GFC #92636
- VA HVACR, PLB & GFC #2710067326
- VA LIC. CLASS B #2705185505
- D.C. HVACR #RM920552
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