Minimum Efficiency Reporting Value (MERV) is a standard of measure employed by the heating, ventilation, and air conditioning industry to gauge a filter's performance. MERV 13 discount filters are highly effective for commercial and industrial settings, or in a home where airborne allergens and pathogens are a concern to occupants.

Designed for two functions, the MERV 13 discount filters prevent unwanted particles from entering the internal devices of a heating or ventilation system and scour passing air to remove possibly hazardous materials that affect the indoor air quality of a home. Houses that are occupied by people with respiratory conditions such as asthma, or who suffer from reactions to airborne allergens, benefit from having the cleanest air possible. A MERV 13 discount filter provides that protection.

The filter media in a MERV 13 discount filter is 100 percent chemical-free, synthetic hypoallergenic material. The media is seamlessly joined to a 30-gauge galvanized frame that refuses to allow gaps, which will let unfiltered air pass. Metal latticework protects the media from trauma and reinforces the frame to prevent warping or damage.

The MERV 13 discount filter itself is electrostatically charged not only to filter particulate debris that passes through it, but also to attract those particles to its body, trapping them so that they cannot circulate in the free, breathable air. Pleating of the filter media provides increased surface area, increasing efficiency and providing more opportunities in which to capture particles that can cause hazards on either side of the barrier.

Because it is the filter's job to hold and keep debris, conditions such as construction work or heavy smoking in a home can shorten the lifespan of filters. Filters should be inspected on a regular maintenance schedule to see that they are not compromised. Inspections ensure that filters are replaced in a timely manner, and before their capacities are exhausted.

Free shipping on discount filters is routine. They should be returned in the same condition as received and with the original packaging, within one year of the date of purchase if needed.