RMS-LB 2018 with 12/20 Revisions

Companion Guidance—Section C CG AARST Companion Guidance RMS-LB 2018 Informational 3 Heating, Cooling and Ventilation Systems Group 1: Basic Heating and Cooling Dedicated system(s) for each room that do not supply additional outdoor air for ventilation. HAC Systems: Many schools and large buildings have forced-air heating and air conditioning (HAC) systems for each room or area. These are systems that might be commonly seen in single-family residences that do not supply additional fresh air for ventilation. Ductless Systems: Some schools and large buildings have rooms or areas where systems do not have forced-air ducted distribution. • Non-Forced-Air Hot and Cold Water Circulation (sometimes referred to as radiator systems). • Window Air Conditioners. • Wall or Baseboard Heating/Cooling Systems. • Split Systems with one unit for cooling and another unit for heat (e.g., Window AC for cooling and Baseboard or Wall units for heat). Group 2: Multi-Zone Systems Multi-zone systems are those where different air handlers or systems are employed and independently controlled for different areas within the same room or portions of a building. Such configurations may have been designed originally or added due to modifications of a building or use of an area. Radon concentrations can vary widely room to room based upon variances in system operations.