Seminar 4 -- Limiting Humidity to Reduce Building Dampness Health Risks (LIVE) PDF

This product is a zip file that contains files that consist of PowerPoint slides synchronized with the audio-recording of the speaker, PDF files of the slides, and audio only (mp3 format) as noted.

ASHRAE’s 2019-2024 Strategic Plan extends 80% occupant satisfaction to include a healthy built environment. Excessive indoor moisture has long caused structural and material damage, and increased occupant health risks. In ASHRAE Standard 62.1:2019 (Ventilation for Acceptable IAQ) the humidity limit is a maximum dew point temperature of 15°C (60°F) rather than 65% RH (without reference to any dry bulb temperature). This requires mechanically cooled spaces to have dehumidification components/controls that limit humidity (occupied and unoccupied hours) when outdoor dew point exceeds 60°F (15°C). This impacts systems design and operation to preserve IAQ and prevent damage to building materials.

1. The Health Argument for Sufficient Management of Moisture in Buildings
   Carl Grimes, HHS, CIEC, Hayward Healthy Home, Monterey, CA
2. Why the Maximum Humidity Limit Changed from Relative to Absolute (60°F Dew Point) in Std 62.1-2019
   Lew Harriman, Fellow ASHRAE, Mason-Grant Consulting, Portsmouth, NH
3. Design Requirements and System Changes to Deal with the Shift to Dew Point
   Brian Hafendorfer, P.E., Member, Gray Architects & Engineers, P.S.C., Lexington, KY