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Higher-rated filtersMERV 13 and aboveare used in medical or industrial settings where air quality standards are stricter

Most airlines allow passengers to bring between 15 and 20 disposable devices

There are many signs that indicate it's the time to change the filters such as reduced airflow, visible dust buildup, lingering odors and worsening allergies

In winter, it gets worse: Windows stay sealed for months There's virtually no fresh air ventilation Every particle your filter misses keeps recirculating A quality pleated filter is your home's first and most effective defense For 1 in 12 Americans, this is a health decision