EXHIBIT 2. Estimated Percentage of Particle Removal for Portable Units by CADR and by Room Size   Percentage of Particles Removed Room Size CADR Smoke (20 min.) Dust (20 min.) Pollen (10 min.) AC T AC T AC T 5 x 6 104080 49%89%95% 68%97%100% 49%88%95% 70%98%100% –57%75% –93%99% 9 x 12 4080150 53%76%89% 71%89%98% 52%75%89% 72%89%98% 24%40%58% 78%86%94% 12 x 18 80150300350450 53%74%89%– – 71%87%97%– – 52%73%– 91%– 72%88%–99%– 24%38%––69% 78%85%––97% 18 x 24 150300350450 51%73%–– 70%87%–– 50%–77%– 71%–91%– 23%––50% 78%––91% 20 x 30 300350450 63%–– 79%–– -67%- -84%- -40% -86%- AC=Removal by the air-cleaning deviceT= Removal by the...

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Gas Furnace Definitions

Annual Fuel Utilization Efficiency (AFUE): The Annual Fuel Utilization Efficiency (AFUE) rating, indicates how well a furnace converts energy into usable heat. The rating is expressed as a percentage of the annual output of heat (output rating in Btus — British thermal units, a measure of energy) to the annual energy input to the furnace (input rating in Btus). Ratings can be categorized in the following way: Low Efficiency: AFUEs below 71 percent. Mid-Efficiency: AFUEs between 71 and 83 percent. High Efficiency: AFUEs of 90 percent and above. Ratings between 84 and 89 percent are not common. Acidic condensate, harmful...

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Air Conditioning Definitions

Air Conditioner: Assembly of equipment for the simultaneous control of air temperature, relative humidity, purity, and motion. Air Cooled: Uses a fan to discharge heat from the condenser coil to the outdoors. Air-Source: Air is being used as the heat source or heat sink for a heat pump. BTU: British Thermal Unit. The amount of energy needed to change the temperature of one pound of water by one degree Fahrenheit. In practical terms, it represents a unit of measure of heat extracted from your home for cooling. Central Air Conditioner System: System in which air is treated at a central...

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Understanding Furnace and Boiler Efficiency Ratings

A central furnace or boiler’s efficiency is measured by annual fuel utilization efficiency (AFUE). AFUE is a measure of how efficient the appliance is in using electricity or fossil fuels (oil or gas) over the course of a typical year. An all-electric furnace or boiler has no flue loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes all-electric furnaces...

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Safety Tips for Natural Gas

Follow directions from the manufacturer for using and taking care of gas appliances. Seek professional help when necessary. Keep combustibles such as papers, fluids, paints, curtains and rags away appliances. Keep gas ranges clean, make sure burner bowls are free of used matches, grease, paper, etc. Have a fire extinguisher near gas appliances at all times. Use a CO2 or dry-chemical extinguisher for the kitchen. Teach children never to light or play with the controls of any gas appliances. Keep the pilot lights of your gas range lit. If you put them out to save energy, a dangerous gas build-up...

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How BTUs and EERs Work

Most air conditioners have their capacity rated in BTUs, or British Thermal Units. A BTU is, generally, the amount of heat required to raise the temperature of one pound of water one degree F. Specifically, a BTU is 1,055 joules, but the first definition is easier to understand in real-life terms. One “ton”, in heating and cooling terms, is 12,000 BTUs. A typical window air conditioner that you find at a local retailer might be rated at 10,000 BTUs. What that means is that the air conditioner has the ability to cool 10,000 pounds of water (about 1,200 gallons) one...

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Understanding Energy Labels

The U.S. government established a mandatory compliance program in the 1970s requiring that certain types of new appliances bear a label to help consumers compare the energy efficiency among similar products. In 1980, the Federal Trade Commission’s Appliance Labeling Rule became effective, and requires that EnergyGuide labels be placed on all new refrigerators, freezers, water heaters, dishwashers, clothes washers, room air conditioners, heat pumps, furnaces, and boilers. These labels are bright yellow with black lettering identifying energy consumption characteristics of household appliances. Although these labels will not tell you which appliance is the most efficient, they will tell you the...

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Energy-Efficient Water Heating

The next time you pay your utility bill, try one simple calculation. Divide the total amount by seven. The result is the amount you spend to heat your water. (If you receive separate utility bills for gas and electricity, use the gas bill for this calculation if you have a gas water heater; use the electric bill if you have an electric water heater.) Of course, you may think this cost is a small price to pay for the convenience of a hot shower. But during the course of a year, this cost adds up. And when you consider that...

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Flood-Damaged Appliances Should be Replaced

What you Need to Know about HVACR Equipment Affected by Flooding After a flood or storm surge from a hurricane, homeowners are advised to take important safety precautions with regard to their home’s heating and cooling systems. A house or basement exposed to standing water can damage your home’s water heater, furnace, boiler, air-conditioning, ventilation, and heat pump system — putting your family at risk. Replace, Don’t Repair Flood-damaged heating and cooling equipment and systems should be replaced and not repaired, according to AHRI. All inspection and replacement work on flooded equipment should be performed by qualified heating and cooling...

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Sample of Manufacturer Response to Flooded Equipment

Technical Bulletin Dated: September 28, 1999 Subject: Flooded Boilers Issued by: Tom Senter, Weil McLain Sample: This bulletin covers how to service a Weil-McLain cast iron boiler, which has been either partially or fully, under water due to flooding condition. DANGER If any part of a boiler, burner or its controls has been sprayed or submerged under water, either partially or fully, DO NOT attempt to operate the boiler until the boiler has been either replaced or completely repaired, inspected, and you are sure that the boiler and all components are in good condition and fully reliable. Otherwise, by operating...

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