Bluewaters: inspect the connected route as well as the filter

The Bluewaters field finding was a kinked flexible connection at a grille. Ceiling height and service-hatch access limited the arrangement. This gives an airflow enquiry a concrete physical-route question without attributing the complaint to a dirty filter.

St. Regis: preserve the measurement conditions

The St. Regis work cut a 200 mm opening and checked different fan modes. High-mode grille velocity was recorded as 8.5 to 6 m/s; low-mode velocity after the change was 4.5 m/s. These are local velocity readings, not whole-room air volume or proof of resolved comfort.

Icon Bay: separate air-path defects from washing

Icon Bay had recorded duct and plenum defects, mould and damaged pipe insulation. Its plan extended to insulation, valve and duct replacement, servicing and grilles. Those findings support asking what installation work is required alongside any cleaning.

What this means for a filter enquiry

Ask which part of the route was inspected and which fan mode or operating check was used. The selected records contain no quantified energy saving from filter cleaning. Keep the finding, proposed action and verification separate.