Intent:
Minimize exposure of building occupants to potentially hazardous particulates, biological contaminants and chemical pollutants that adversely impact air and water quality.
Requirements:
Design to minimize pollutant cross-contamination of regularly occupied areas:
- Employ permanent entryway systems (grills, grates, etc.) to capture dirt, particulates, etc. from entering the building at all high volum entryways.
- Where hazardous gases or chemicals may be present or used (including garages, housekeeping/laundry areas, and copying/printing rooms), provide segregated areas with deck to deck partitions with separate ouside exhaust at a rate of at least 9.2 m3/hour. m2, (0.5 cpm/ft2), no air re-circulation, and operated at a negative pressure compared with the surrounding spaces of at least an average of 5 Pa and with a minimum of 1Pa when the doors to the rooms are closed.
- Provide containment drains plumbed fro appropriate disposal of hazardous liquid wastes in places where water and chemical concentrate mixing occurs for maintenance or laboratory purposes.
-Replace all filtration media immediately prior to occupancy. Filtration media shall have a minimum efficiency reporting value (MERV) of 13, as determined by ASHRAE 52.2-1999 for media installed at the end of construction.
References:
ASHRAE stanadard 52.2-1999 Table 1
Requirements for MERV Value of 13
Composite Average particle size efficiency %
0.30~0.10um <75%
1.0-3.0 um >=90%
3.0-10.0 um >=90%
Minimum Final Resistance
350 Pa
