Expert interpretation

Are All Occupied Pressure Environments Regulated Under PVHO-1?

Direct answer: No. Human occupancy and a pressure differential greater than 2 PSI do not universally establish that PVHO-1 certification is required.

The mHBOT question remains whether PVHO-1 is technically applicable, legally required in a jurisdiction, or voluntarily adopted.

Editorial disclosure: Educational information only; not legal, medical, regulatory, or engineering advice. Published 2026-08-20; last reviewed 2026-08-20.

Review primary sources · Editorial policy and corrections