Health & Fitness

What To Look For In An Air Filter

An air filter serves many important functions. It should be able remove solid particles from air. Some are designed to remove gases and odors, and some are both. You can read this article to learn more about the features you should look for when purchasing an air filter for home or business from While MERV ratings are important in choosing an air filter, you should also consider other factors such as clean air delivery rate or dust spot efficiency.

Rating MERV

Air filters’ MERV rating refers to their ability to trap particles in the air. These particles can range in size from three to ten microns. The best filters for controlling contaminants that could cause health problems have a MERV rating 16 and are the highest quality. These filters are also very effective in controlling odors and lead from tobacco smoke and other pollutants in the air that can be released by sneezing or coughing.

Dust spot efficiency

Efficiency refers to the device’s ability remove particulate material from an atmosphere stream. The test involves measuring the concentrations of particulate material in the airstream and downstream. For air filters, the Atmospheric Dust Spot Efficiency, officially referred to as ADE, measures how effective a filter is at removing staining particles from the airstream. High MERV ratings are a good indicator of air filter performance.

Most penetrating particle size

There are many different ways to evaluate the effectiveness of an air filter, including most penetrating particle size, or MPPS. While EN 1822 defines the filtration efficiency of HEPA filters and ULPA filters respectively, the new ISO standard uses Most Penetrating Particle Size to evaluate air filters. This new standard uses the same standards for determining the effectiveness of filters, but is based on different physical mechanisms.

The best filters capture particles as small and as small as 0.3 microns. HEPA filters perform best when they capture particles less than 0.3 microns. Despite these challenges, HEPA filters are widely used in homes and offices, and are considered to be the best filters for the protection of air quality.

Clean air delivery rate

It is important to know the “Clean air Delivery Rate” (or CARDR) of any air filter you are considering purchasing. CARDR measures how well the filter can trap particles and how much “clean” air the device delivers. The figure is the cubic feet of clean air delivered per minute, multiplied by the air flow rate through the device. This number shows how efficient the filter is and how it can improve indoor air quality.

About the author