Concern: Long Reach High School: September 24th, 2019 (CXLRHS2019000117)

Room 346
Date of IEQ Report Form
Date of Report
Every morning the room smells like mildew and is very humid. Several other staff members have commented on the sour smell anytime they enter the room throughout the day.
IEQ Investigation Process

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: October 4 and 7, 2019

No odors were identified upon entering the room (afternoon of October 4).

A stale odor typical of carpeted classrooms was observed the morning of October 7, prior to school starting. The room had not yet been occupied.

Temperature (76.1 degrees Fahrenheit), relative humidity (49.6 %), carbon dioxide (883 parts per million (ppm)), and carbon monoxide (0.0 ppm) readings were acceptable.

No mold growth was observed within the space.

No elevated moisture was detected in the carpet.

No signs of moisture (flaking/peeling paint) was observed on the exterior wall.

The room was screened with a thermal infrared camera. No thermal anomalies indicative of moisture intrusion were observed.

Areas above the drop-ceiling were assessed. No concerns were identified above the drop ceiling.

The Unit Ventilator (UV) that services the room was inspected. Minor dirt deposits were observed on the fans within the unit.

The odor sensed by occupants may be influenced by Long Reach High School's Heating Ventilation and Air Conditioning (HVAC) system and/or the rooms carpet:

  • The odor is likely associated with building materials and room supplies which are influenced by expected fluctuations of indoor and outdoor air temperatures and humidity levels. The unit ventilators fan operates continuously during scheduled hours of operation. The ventilation unit will not be cooling or heating if the room’s thermostat is satisfied. As a result, if the room's temperature set point is satisfied and weather outdoors is damp/humid, the ventilation will introduce unconditioned air into the space. "Musty/mold" odors are often reported under these circumstances.
  • Carpet odors are considered a nuisance (not a safety concern) and tend to dissipate after the HVAC begins operation (dilutes odor).
Corrective Actions
October 4th, 2019

A work order was placed for Building Services (HVAC) to clean the rooms UV, check the outside air dampers, and review the UVs operating schedule. 

Date Closed
Tracking Number