Page 297 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

260 Cha pte r S i x

Average Average Average
Removal Removal Removal Minimum Final
Group MERV Efficiency (%) Efficiency (%) Efficiency (%) Resistance (in.
Number Rating 0.3 to 1 μm 1 to 3 μm 3 to 10 μm water gage)
1 1–4 — — <20 0.3
5 — — 20–34.9
6 — — 35–49.9
2 0.6
7 — — 50–69.9
8 — — 70–84.9
9 — <50 ≥85
10 — 50–64.9 ≥85
3 1.0
11 — 65–79.7 ≥85
12 — 80–89.9 ≥90
13 <75 ≥90 ≥90
14 75–84.9 ≥90 ≥90
4 1.4
15 85–94.9 ≥90 ≥90
16 ≥95 ≥95 ≥95

Source: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org.

TABLE 6.3.1 MERV Ratings from ASHRAE 52.2-1999: Method of Testing General Ventilation
Air-Cleaning Devices for Removal Efficiency by Particle Size.

as gases, while most of the larger molecules are liquids or solids at room temperature. There
are some larger polymers and supermolecules, but they are not a common ambient air
pollution concern. For the sake of a physical comparison, note that a typical textbook may
have a page thickness of about 70 μm.]
Special Circumstances and Exemplary Performance
There is no EP point for this credit in either LEED version 2.2 or 2009.

IEQ Credit 3.2: Construction IAQ Management Plan—before Occupancy
IEQ credit 3.1 lists a series of measures that can be taken during the construction phase
to reduce the potential for air pollution from construction affecting both the workers
and the occupants after construction. Then IEQc3.2 lists a series of additional measures
which can be taken just before occupancy to further ensure good air quality. IEQc3.2 is
worth one point in both LEED 2.2 and LEED 2009.

USGBC Rating System
LEED-NC 2.2 lists the Intent, Requirements, and Potential Technologies and Strategies
for IEQc3.2 as follows, with additions noted for LEED 2009 requirements:
Intent
Reduce indoor air quality problems resulting from the construction/renovation process in order
to help sustain the comfort and well-being of construction workers and building occupants.