"plasma air ionization" - Google News
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Schools spent millions on high-tech air purifiers. But are they actually making things worse? Mother JonesWhat you need to know about furnace filters - Globalnews.ca
TORONTO – If you're like most people, you probably don't give your furnace much thought as long as it's keeping you warm in the winter and cool in the summer. But in order to keep it working to its optimal performance — and help prevent a possible malfunction — you need to either change or clean your furnace filter on a regular basis. Sounds simple, but in reality there are so many options for furnace filters that choosing the wrong one can do more damage to your furnace than good and could potentially cause your furnace to break down. How a furnace works A traditional forced-air furnace draws air in via return ducts, warms it over a heat exchanger then, with the help of a blower fan, pushes the heated air through a series of ducts that branch off into rooms throughout your home. The furnace runs until the temperature inside reaches your desired thermostat setting. (If you have whole home air conditioning the process is similar with the air being cooled in the summer by a...
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