National Oilheat Research Alliance 23 and Fresh Air Damper (Figure 20) can meet the ASHRAE 62.2 residential ventilation standard. Healthy Home System Control Plus is a multifunctional programmable control, Figure 21. It operates in parallel with a ducted HVAC appliance to minimize electrical cost and deliver fresh air even when not heating or cooling. When utilized with properly sized fresh air dampers, the system can manage ventilation and make up air requirements. Indoor Air Quality In 2012, the Environmental Protection Agency declared Indoor Air Quality a National Health Hazard. Indoor Air Quality is among the top five risks to the nation’s public health. The Environmental Protection Agency and the Center for Disease Control place indoor Air Quality into three important categories: Germs, Gases and Particulates. The pie chart helps identify the average percentages of contaminants. As you can see, Germs contribute approximately 34%. They are known as bioaerosols: bacteria, viruses, fungi, pathogens and allergens. Gases contribute approximately 31%. These are Volatile Organic Compounds (VOCs) which consist of gas molecules, odors and toxins. Particulates contribute approximately 35% and consist of organic and inorganic particulates, such as dust, smoke, pollen, animal dander and dust mites. The first step in improving indoor air quality is to reduce or eliminate the source of pollutants. Particulates The typical HVAC ducted system usually has a one-inch filter. The average low cost inefficient filter merely keeps the appliance clean. To make a difference in airborne particulate capture, a MERV-8 to MERV-13 is a sound approach. The higher MERV rating indicates better particulate capture. Static pressure usually increases with a higher MERV rating. A ducted system must be properly designed to handle the increase in static pressure. A poorly Figure 20 Figure 21
NORA Advanced Air Flow
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