A standard for all spaces intended for human occupancy except those within single family houses, multifamily structures of three stories or fewer above grade, vehicle and aircraft. ANSI / ASHRAE 62.2 Ventilation and Acceptable Indoor Air Quality in Low Rise Residential Buildings (three stories or less) These ventilation standards are available for purchase from ASHRAE. (www.ashrae.org); phone 404-463-8400; 1791 Tullie Circle NE. Atlanta GA 30329. There are three basic ventilation types: Supply Ventilation • Uses a fan to force outside air into a home • Can operate continuously or intermittently and be ducted to single or multiple locations • A Central Fan Integrated Ventilation system differs because it uses a control and inter faces with the HVAC system central fan for whole house ventilation. 22 National Oilheat Research Alliance Exhaust Ventilation • Uses a dedicated fan or bath fan to exhaust air from the home • Replacement air is uncontrolled and ventilation is typically distributed unevenly • Pockets of poorly ventilated areas can exist Balanced Ventilation • Uses a fan to bring air into the home while simultaneously exhausting an equal amount of air from the home. • The system can operate continuously or intermittently—Heat Recovery Ventilator (HRV), Figure 19 or Energy Recovery Ventilator (ERV), respectively • The system can be connected with the centrally ducted system for whole house ventilation or can be independently ducted to serve one or more areas. Heat Recovery Ventilator Healthy Home System Control Plus (HHSC+) Fresh incoming air HRV Configuration Stale Air Exhausted Figure 19
NORA Advanced Air Flow
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