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The AHU provided 1,273 cubic foot per minute (cfm) of air. The supply air system was balanced so each room received approximately 1 cfm of air per square foot of floor space. A single return air grille in the dining room conveyed air to the AHU from the test home. Consistent with a typical residential installation, the AHU did not have an outdoor air intake.
3.2.1 Envelope Leakage
The envelope leakage rate of the test home was measured in accordance with American Society for Testing and Materials (ASTM) E779-99 by conducting a Minneapolis Blower Door Test (ASTM 1999). The test consists of a powerful variable speed fan that is sealed into an exterior doorway and used to blow air either into or out of the test home. Gauges are used during the testing to measure the pressure difference between inside and outside of the house. Figure 3.4 depicts the blower door test equipment on the exterior double door of the test home.
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From the data collected during the testing EH&E determined that the approximate leakage
area of the test home was 624 square centimeters.
3.2.2 Infiltration
The air exchange rate of the test home was measured in accordance with ASTM E741-00 with sulfur hexafluoride (SF6) as the tracer gas (ASTM 2000). The testing was conducted by releasing SF6 into the test home and recording the SF6 levels in multiple areas of the test home over an extended time period. The decay rate of the SF6 levels is used to calculate the air exchange rate. Three air exchange rate measurements were made prior to initiation of testing and the values ranged between 0.05 and 0.15 air changes per hour (ACH). As detailed later, air exchange rates of this magnitude were observed consistently throughout the testing program.
3.3 AEROSOL GENERATION
EH&E characterized the performance of each air cleaning system when challenged with a fine dust standard aerosolized inside the test home and with fungal spores present in outdoor air brought into the home. The fine dust standard used in this testing is identical to the dust material required by the AHAM protocol for evaluation of household portable
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electric air cleaners (AHAM 2002). The fine dust standard includes a wide range of particle sizes extending from less than 0.1 μm to 20 μm.
The fine dust standard was aerosolized with a Pitt 3 Acoustical Generator designed and constructed by the University of Pittsburgh. The Pitt 3 Generator utilizes acoustical energy generated from a loudspeaker to aerosolize powdery materials. Energy from the loudspeaker, in the form of sound waves, vibrates a latex membrane that in turn vibrates the air column and fine dust standard in the plastic tube. The sound waves dispense the particles, which are then carried out with the airflow escaping the top of the plastic tube. Clean, filtered compressed air is supplied at the bottom of the tube and is delivered to the room from a hose attached to the top of the tube along with entrained particles.
3.4 INSTRUMENTATION
3.4.1 Sample Locations
The location of the sampling instruments throughout the test home is indicated on Figure

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