Before & After Is Not Enough: What Duct Cleaning Evidence Should Include

Before-and-after photographs are useful, but they are not the whole evidence story. In commercial facilities, a service handover should help the client understand what was inspected, what was cleaned, what could be verified and what still needs attention.

Start with the scope

Evidence is meaningful when it connects to a defined area or system. The project should identify which ducts, hoods, risers, access points or assets were included.

Capture condition before work

Pre-service photographs or inspection images establish a baseline. Where possible, images should be identifiable by location or section.

Document execution

A smaller, organised set showing access, cleaning method, site protection and key stages can be more useful than an uncontrolled photo dump.

Verify after cleaning

Post-service images should focus on the same or comparable sections. If the camera angle is different, present them honestly rather than force a misleading slider comparison.

Complete the handover

Depending on the project, the final pack may include photographs, inspection records, checklists, client sign-off and a service certificate or completion document.

For Duct Clean Co., evidence is part of the service itself: inspect, clean, verify and document.