There are many different factors that determine how effective a furnace filter is when used in a residential or commercial property. The MERV rating is one of the main factors to review when searching for the right product, which determines how many pollutants, pet dander, and dust is collected when the furnace is in use. Cheaper filters have a MERV rating of 2 and more efficient filters have a rating of at least 11. Economical filters that cost less are only designed to keep the filter clean and trap dust. More durable filters that have a MERV rating of 12 are commonly used in hospitals and laboratories. They’re designed to trap bacteria, pet dander, smoke, viruses, coughs, sneezes, and odors, which can create a healthier interior setting that alleviates allergies, respiratory issues, and asthma. It’s important to inspect the furnace in advance to determine the recommended MERV rating. In some cases, a filter with a high MERV rating can cause the appliance to work too hard, which can increase energy usage and affect the lifespan of the parts.
The filter should also be constructed well with quality materials to ensure that it can uphold its strength and structure for several months before it needs to be replaced. Cheaper filters are prone to collapsing or deteriorating when exposed to humidity or moisture.