MALB_2014 with 1-21 Revisions

Conducting Measurements of Radon and Radon ANSI/AARST MALB-2014 with 1/21 Revisions Decay Products in Schools and Large Buildings 45 INFORMATIVE EXHIBIT 6 HVAC GROUP DESCRIPTIONS Page 1 of 3 Definitions of basic and complex HVAC systems as applicable to this standard of practice. Advisory —If it is unclear what type of system is present, consult with the building representative, a mechanical engineer or a qualified heating and air conditioning contractor. HVAC - DEFINITIONS AND SPECIAL CONSIDERATIONS Group 1: Basic Heating and Cooling A dedicated system for each dwelling or unique area that does not provide seasonally variable outdoor air ventilation for added comfort or energy savings. • Forced-air heating and air conditioning (HAC) systems such as normally seen in single-family residences. • Ductless Systems — Non-Forced-Air Hot and Cold Water Circulation (sometimes called radiator systems). — Window AC (w/fresh air closed). — Unit Ventilators (w/fresh air closed). — Wall or Baseboard heating/cooling. • Ductless Split Systems: One system for cooling and one for heat (e.g., Window AC for cooling and Baseboard heat). No Special Consideration Group 2: Multi-zone Systems Independent systems and controls for different areas within the same dwelling or unique sector. See Section 3.5 for testing recommendations Group 3: Variable Outdoor Air Ventilation HVAC systems that temporarily vary outdoor air ventilation for seasonal comfort or energy savings in: - individual dwellings; - multiple dwellings; or - the whole building. Such systems include those known as: Energy Economizer systems, Energy Recovery Ventilators (ERV) and Evaporative (swamp) cooling systems. See Section 4.2.2 for additional testing requirements Group 4: Variable Air Volume Distribution HVAC systems where airflow from a single air handler is distributed among multiple dwellings with independent thermostat controls in each dwelling that variably open and close dampers for heated or cooled supply air. Such systems are commonly called Variable Air Volume (VAV) systems. See Section 4.2.3 for additional testing requirements