indoor air quality

Several factors relating to the HVAC system contributes to Indoor Air Quality (IAQ) problems. Few of them are related to inadequate building pressurization and dehumidification, intrusion of high-moisture from outside air, inside surfaces that promote or permit microbial growth. Most building designers and contractors think that following established building codes and repeating strategies used in past projects will guarantee success in new buildings. However, satisfying codes alone does not ensure that the combination of design features will work together to prevent IAQ problems.

The HVAC complements the building envelope by properly conditioning the interiors and pressurizing the building with dehumidified air. A functional test before acceptance should include several testing, measuring and verification. Building air leakage rate, air exchange rate, differential pressure, ambient building conditions, moisture, particles content, and filter’s efficiency should be tested as a minimum.

Airborne and structure-borne sound and vibration are becoming common complaints in modern buildings. There are many locations on a building that may be a source of noise and vibration and also room layouts. Background sound levels at the site should be tested as well as in the building.

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