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: September 23 and 24, 2024
September 23
The Office of the Environment identifed a nuisance carpet odor at the time of assessment. The school staff member confirmed that the odor observed by the Office of the Environment was the odor of concern. The staff member noted that the smell was stronger prior to the Heating Ventilation and Air Conditioning (HVAC) system operating.
The Office of the Environment collected temperature (69.8 F), carbon dioxide (518 ppm), and relative humidity (58.5%) readings from the classroom. These levels were found to be acceptable.
The carpet was probed in various locations with a moisture meter. No elevated moisture was detected.
The return appeared to be free from obstruction and generally clean.
No obvious indications of leaks were observed around the sink or above the drop ceiling tile.
No visible or olfactory indications of mold were observed.
September 24
Since odors can be subjective, a different staff member from the Office of the Environment visited the space to perform an assessment.
The assessor arrived prior to the HVAC system operating and was present after the unit began operating. A nuisance carpet odor was present (not considered moldy/musty), however this odor does not represent a health and safety concern.
The HVAC Unit that served the area was assessed after it became operational:
- The outside air dampers were open.
- The filters were in good condition.
- No concerns were identifed with the coils or condensate pan.
- The energy wheel was not rotating.
Conclusion
The odor experienced appears to be a nuisance carpet odor. It is likely, the odor is more noticeable in the mornings due to lack of HVAC and doors being closed overnight. Once the HVAC begins operation, it takes some time for the outdoor air introduced from the HVAC system to dilute the odor.
Although likely unrelated to the concern (energy management), the energy wheel within the HVAC unit was not rotating. A work order was placed for Building Maintenance (HVAC) to assess and address.