MALB_2014 with 1-21 Revisions

Normative Appendix A ANSI/AARST MALB-2014 with 1/21 Revisions A— Reporting Building Operating Conditions 12 Table A-1 Some Cities And Locations In This Climate Zone Note—Exact percentages will vary slightly depending upon location Miami, FL Puerto Rico Virgin Islands Honolulu, HI Guam n Very Hot Climate Zone 1 Certain tropical areas such as Hawaii and the southern tip of Florida This data is based on Miami, FL 24 Hour Averages For dwellings and other 24 hour occupancies Operating Condition Prevailing Annually Heating Conditions - Cooling Conditions 50% Mixed Conditions 50% Normal Operating Condition • Virtually equal periods of cooling and inactive HVAC. Condition less likely to inhibit characterization of a radon hazard • When each day tested includes periods of both: a) outdoor temperatures below 84˚ F (29˚ C), and; b) cooling systems active with some degree of regularity. • No variance in outdoor air ventilation Additional Considerations Consider Long-Term or additional testing to account for both conditions. Daytime Averages For non-residential occupancies Operating Condition Prevailing Annually School (prevailing across 9 months) Heating Conditions - - Cooling Conditions 75% 66% Mixed Conditions 25% 33% Normal Operating Condition • Cooling systems active Condition less likely to inhibit characterization of a radon hazard • When each day tested includes periods of both: a) daytime outdoor temperatures below 84˚ F (29˚ C), and; b) cooling systems active with some degree of regularity. • No variance in outdoor air ventilation Additional Considerations • Consider additional testing to evenly account for each condition or an Assessment of Occupied Versus Unoccupied Conditions .