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 10 3.4 Large Rooms or Open Areas For large rooms and open areas, one detector shall be placed for every 2,000 square feet (186 m 2 ). 3.4.1 Open-Plan or Pod Design Where an open-plan or pod design area has moveable walls that can physically separate an area into individual rooms, the movable walls shall be configured to divide the area into individual rooms and each resulting room shall be measured separately. Where moveable walls are absent or inoperable, the area shall be measured as one room. 3.5 Multi-zone HVAC Systems Informative Advisory — Multi-zone HVAC systems, as described in Exhibit 6 , Group 2 are sometimes found for larger open rooms or dwellings. Whenever encountered, it is recommended to place enough additional detectors to adequately characterize and record differences between areas or rooms that are served by the different HVAC systems . 3.6 Inaccessible Ground-Contact Locations When restricted access is imposed by independent owners of ground-contact locations , the lowest accessible level of the building that is closest to ground shall be tested in accordance with Section 3.1 Ground-contact Locations. 3.7 Choosing A Room Note—It is best to choose test locations where people are more likely to spend time, such as a finished or occupied room when this choice exists. When this choice does not exist, preferred choices are areas not currently used or finished but that could serve as a work area, playroom or an additional bedroom at some time in the future. 3.8 Choosing A Location Within A Room Detectors shall be placed in accordance with Table 3.8 . Note—As overall guidance, test in the general breathing zone. Figure 3 H Inaccessible Figure 3 E 2,000 Sq. Ft. Figure 3 G Multi-zone HVAC Figure 3 F Moveable walls Inaccessible ground-contact locations