A process procurement can audit.

A robot crawler or borescope camera goes into representative duct runs, and the AHU internals are surveyed with instruments. The point is evidence before commitment: you see the interior condition of your own system, photographed and dated, before any scope or price is discussed. If the system is clean, the report says so and the engagement can end there.

you receive: inspection report with photo log

Before a single brush turns, the work zone is isolated: barriers where needed, negative-air machines with HEPA filtration putting the duct run under suction, electrical lockout under your permit-to-work system. The containment plan is written down and shared — your EHS team can review it before work begins, not after.

you receive: written containment plan

Source removal, not masking: rotary brushes, air whips and robot-driven tools dislodge contamination, and negative pressure pulls it to HEPA collection. Work is sequenced zone by zone, typically after hours, so the facility keeps operating. Each zone closes with a dated entry in the cleaning log — which equipment, which run, which technician.

you receive: dated cleaning log per zone

The inspection is repeated on the cleaned runs, deliberately matching the framing of the before photos. This is the step most vendors skip, and the reason our reports survive procurement scrutiny: the before/after pairs show the same section of the same duct, not a flattering angle of a different one.

you receive: post-verification photo set

Everything produced along the way — inspection findings, containment plan, cleaning logs, verification photos, airflow readings where taken — is compiled into a single closure report with a dated completion certificate. It is written to be filed: your next audit, insurance renewal or global EHS review can cite it directly.

you receive: closure report & certificate