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The effective control of accumulation mode particles by Trane CleanEffects™/American Standard AccuClean™ is of special interest because particulate air pollutants of anthropogenic origin are ubiquitous in this size range. Particles of anthropogenic origin are emitted directly from sources or formed from interactions among gases emitted from various sources. Examples of anthropogenic sources of accumulation mode particles emitted to outdoor air include cars and trucks, electric power plants, and manufacturing operations. Because of their small size, accumulation mode particles in outdoor air easily enter homes by moving through and around doors, windows, and other penetrations in the building envelope. Common indoor sources of accumulation mode particles include cooking and cigarette smoking. Accumulation mode particles also include constituents of biological origin such as mold spores, cat and dog allergen, bacteria, virus, and some pollen.
The control of particulate air pollution in the accumulation mode is important for public health because non-biological and biological particles in this size class have been
Environmental Health & Engineering Project #13603 Whole House Air Cleaning System Page #12
associated with increased risks of a variety of adverse health outcomes. Particle concentrations are associated with increased risk of premature mortality and a variety of cardiopulmonary effects, including myocardial infarction (heart attack) and respiratory effects such as bronchitis and asthma attacks. Exposure to mold and certain animal allergens has been associated with asthma exacerbations and lower respiratory symptoms. Notably, a threshold for response of sensitized individuals to particle and allergen exposure has not been demonstrated. For these reasons, the demonstrated ability of Trane CleanEffects™/American Standard AccuClean™ to remove particles rapidly from indoor and to achieve low steady-state levels of particles indoors is anticipated to have a health benefit.

2.0 INTRODUCTION
The following report describes a detailed evaluation of the air cleaning effectiveness of the Trane CleanEffects™/American Standard AccuClean™ whole house air cleaning system by Environmental Health & Engineering, Inc. (EH&E). Testing was conducted between May and December 2005 in the test home located adjacent to EH&E’s main office in Newton, Massachusetts. The testing was conducted as a joint research project between EH&E and investigators from the Harvard School of Public Health (HSPH).
Objective
The objective of the testing was to quantify the effectiveness of Trane CleanEffects™/American Standard AccuClean™ for removing contaminants from indoor air through comparison to industry standards, the performance of alternative systems, and health-based considerations.
Approach
The performance of Trane CleanEffects™/American Standard AccuClean™ and alternative systems was evaluated in the test home under controlled and well-documented conditions. Measurements were obtained to determine the whole-home particle removal and clean air delivery rate achieved by Trane CleanEffects™/American Standard AccuClean™ and alternative systems. The in-duct air cleaning systems tested were:

1-inch standard filter
5-inch pleated filter
Conventional electronic air cleaner (EAC)
Trane CleanEffects™/American Standard AccuClean™

EH&E also conducted tests with portable household electric air cleaners in the test home.
The units and configurations tested were:

1 Hunter Quiet Flo™ HEPA Air Purifier Model 30216
5 Hunter Quiet Flo™ HEPA Air Purifier Model 30216
3 Ionic Breeze Quadra™ Silent Air Purifier

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