Staff would like to know if there are deflectors that can be placed to divert the air from the back corner desk which gets the most air from the blower; and would like to have the duct check for mold and other particles.
Identify deficiencies that may impact IEQ and/or sources of odor concerns. Typically includes the following depending on the nature of concern, but not limited to:
- interview/questionnaire of concern individual(s)
- inspection above drop ceiling (condition of roof deck, pipe insulation, return air plenum)
- inspection of ventilation system (operation of variable air volume box and outdoor air dampers, check controls, measurements of carbon dioxide, temperature and relative humidity, sources near outdoor air intake, measure return and supply air volume, cleanliness of coils, liner and condensate pan)
- inspection of exterior
- inspection below drop ceiling (housekeeping, sink and floor drain traps, signs of past and present moisture concern via visual and/or moisture meter, mold growth, ensure connection of current and capping of abandoned sanitary vents, odorizers, excessive plants and fabric items, identify potential pathways, and measure volatile organic compounds, carbon monoxide, and lighting)
Date(s) of Assessment: November 12, 2024
The supply diffusers and visible interior portions of ductwork were assessed. No suspect mold growth was observed on the supply diffusers or within visible portions of the supply ducts.
No odors were identifed in the area of concern or emanating from the duct work.
Surfaces were assessed for visible mold growth. No mold growth was observed on/under surfaces.
The drywall and carpet in the area was assessed for elevated moisture using a moisture meter. No elevated moisture was detected.
Smoke testing was performed in the occupants area to determine if the an excessive draft was present. Smoke dispersal was considered low indicating a draft is not present and that air mixing could be improved.
A data logger was placed in the area and operated from November 12th to 19th to measure carbon dioxide. Carbon dioxide readings can be an indicator that sufficient outdoor air is being delivered. The carbon dioxide readings were not elevated, indicating sufficient outside air.
Air Handling Unit-2 (AHU-2) was assessed:
- The outside air dampers were open.
- The filters were in place, in good condition, with no filter bypass observed.
- No concerns with the coils were observed.
- The sound liner within the unit was in good condition with no moisture or visible mold growth present.
- An access panel was opened within the ductwork leading from the unit to the occupied portions of the space. The sound liner was in good condition with no moisture or visible mold growth.
- No odors were observed within the unit.
- Air flow measurements indicated a reduction in air flow in the supply diffuser closest to the occupant, which supports the low dispersal identifed during the smoke test. The cause of this appears to be due to the length of the flex duct connected to the supply diffuser, which also has a sharp bend in it, which would reduce air flow.
Conclusion
Air flow should be increased in the supply diffuser closest to the occupant. This can be achieved by rerouting the flexible duct to minimize the ducts length and reduce the need for a bend.
A work order was created for Building Maintenance (HVAC) to re-route the flexible duct.