MAMF_with 1-21 Revisions

MAMF/MALB Companion Guidance 2021 Section 5 Average Building Conditions 10 5) Identify The Normal Average Occupied Operating Condition A. Calculate the Average Occupied Operating Condition The operational condition for the building or unique sector of the building that represents the greatest amount of significantly occupancy time. B. Clear Characterization Identify the operating conditions most likely to emphasize a clear characterization of a radon hazard. This is primarily time periods when the difference between indoor and outdoor temperatures cause: a) Some degree of regularity for natural negative air pressure inside the building as compared to outside of the building (e.g. stack effect), and; b) Some degree of regularity in the activity of heating or cooling system blowers. This would not include time periods when the volume of outdoor air introduced into the building exceeds the minimum amounts required to maintain occupant health. EXAMPLE WORKSHEET 1) Identify the average occupied indoor temperature: q 74˚ F (23˚ C) q Other ____________. 2) Identify the months per year that represent significant occupancy for each unique sector of the building. q 12 months (as common for dwellings and most large buildings that house business occupancies). q 9 months (as common for many school buildings). q Other _____________________________________________________________ Identify the hours of the day that represent significant occupancy for each unique sector of the building. q 10 hour occupancies (e.g., Work or school day plus routine afternoon meetings, classes or sports). q 24 hour occupancies (e.g., Dwellings and 24/7 services such as hospitals). q Other ________________________________________________________________________ 3) Identify the average outdoor temperatures during periods of significant occupancy. Annual ____ Jan ____ Feb ____ Mar ____ Apr ____ May ____ Jun ____ Jul ____ Aug ____ Sep ____ Oct ____ Nov ____ Dec ____ 4) Calculate average HVAC activity during significantly occupancy periods HVAC Mode Months in each operational mode Total Months Yearly % Heating Active q Jan q Feb q Mar q Apr q May q Jun q Jul q Aug q Sep q Oct q Nov q Dec ____ ____% Cooling Active q Jan q Feb q Mar q Apr q May q Jun q Jul q Aug q Sep q Oct q Nov q Dec ____ ____% None (mixed) q Jan q Feb q Mar q Apr q May q Jun q Jul q Aug q Sep q Oct q Nov q Dec ____ ____% Example for Schools Daytime Averages