Indian OT Clean-Corridor + Sterile Air Cascade — NABH + JCI + ASHRAE 170 + FGI 2022 + USP 797

Indian 8-OT block clean-corridor MEP demands ₹125-420 Cr by accreditation level with pressure-cascade OT (+25 Pa) → corridor (0) → dirty (-15) → soiled holding (-25), separate clean + dirty corridors with airlock + commissioned smoke test. NABH + ASHRAE 170 + FGI 2022 + USP 797 + WHO + JCI govern. Three failures: clean + dirty corridor shared causing cross-contamination, pressure cascade not commissioned with smoke test, soiled holding not at -25 Pa.

Indian OT clean-corridor design framework

OT (Operating Theatre) clean-corridor design — Indian OT block follows clean-and-dirty corridor segregation. Clean corridor: staff + sterile supply + patient. Dirty corridor: used equipment + linen + waste. Standards stack — NABH Hospital Accreditation Chapter HIC + 5th Ed OT + USP 797 + ASHRAE 170 + FGI 2022 + WHO + IS 1893 + IS 1172. Indian OT block requires positive-cascade pressurization (OT > corridor > anteroom).

Indian OT clean-corridor MEP scope — 8 OT block

Three Indian OT clean-corridor failures

1. Clean + dirty corridor share — cross-contamination — NABH + FGI require separate clean + dirty corridor + air-lock between. Indian OT blocks sometimes share to save space — fails infection-control audit. Cluster + acuity-segregation as design rule.
2. Pressure cascade not commissioned with smoke test — pressure direction critical for sterility. Indian sites measure ΔP but skip smoke-pencil test at doorway. Specify per ASHRAE 170 + USP 797 + NABH commissioning.
3. Soiled holding room not in negative pressure — soiled holding < -25 Pa vs corridor required. Indian OT blocks sometimes ignore — odour + microbe drift back into clean zone.