Off gassing is the release of volatile organic compounds (VOCs) from building materials, furnishings, and products into indoor air. This process occurs when chemicals trapped in materials evaporate at room temperature, typically most intensely within the first 72 hours after installation or purchase. Off gassing can continue for weeks or months depending on the material and environmental conditions.
Technical Details
Off gassing rates depend on temperature, humidity, air circulation, and material composition. Higher temperatures accelerate the process, while adequate ventilation helps remove released compounds. Common sources include adhesives, paints, carpets, and upholstery. HVAC systems with proper filtration can help capture some volatile compounds, though source control remains most effective.
Indoor Air Quality Impact
Off gassing contributes to sick building syndrome and poor indoor air quality. Occupants may experience headaches, respiratory irritation, and fatigue. Selecting low-VOC or no-VOC materials and maintaining ventilation rates of 15 CFM per person according to ASHRAE 62.1 standards significantly reduces exposure and health effects.