What is the MERV rating of a filter?

Minimum Efficiency Reporting Value (MERV) is a standard that rates the overall effectiveness of air filters. Higher value MERV rating equates to finer filtration, meaning fewer dust particles and other airborne contaminants can pass through the filter.
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What is the MERV rating for a HEPA filter?

HEPA stands for High Efficiency Particulate Air filters and they are super-efficient. They will range from 17-20 MERV. HEPA filters meet standards that remove at least 99.97% of airborne particles down to the size of 0.3 microns.
  • Do you really need a HEPA filter?

    “You don't need a HEPA filter to stop dust mite, and pollen particles, as they are relatively huge. Any good vacuum cleaner should stop cat hair and dander.” But May says that HEPA filters help contribute to a healthy home environment, even for those without allergies or asthma.
  • Do you have to run air purifiers all the time?

    Leave your air purifier on all the time. If you're concerned about energy usage, turn the fan speed to low. (Luckily, most air purifiers don't require very much energy only about the same amount as your computer.) You cannot run an air purifier for a couple of hours and expect your air to remain clean.
  • Can you clean a humidifier with hydrogen peroxide?

    Disinfecting Your Humidifier. Once you have cleaned the humidifier, you can disinfect it with the help of bleach (or hydrogen peroxide, if you prefer). Fill the water tank with water, and add one teaspoon of bleach or hydrogen peroxide per each gallon of water. Rinse thoroughly with clean water.

Updated: 25th November 2019

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