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Here are some useful terms to understand when purchasing an air purifier: AHAM: Association of Home Appliance Manufacturers. They are an organization that independently verifies the manufacturer's claims on recommended room size and CADR (clear air delivery rate). They are also recognized by the EPA as a Certification Body and are approved to verify Energy Star requirements.  CADR: Clear air delivery rate. This indicates the volume of air filtered by the purifier. AHAM tests purifiers on three categories — dust, tobacco smoke, and pollen — and assigns a CADR number to each. The higher the CADR numbers, the faster the purifier performs. Energy Star: Energy Star approved air purifiers are 40% more energy efficient than standard models. To meet the performance requirement, air purifiers must have at...

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