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Air filters with a high MERV rating, 11 or above, shouldn't cause airflow problems in most residential systems. However, the airflow can be restricted in some HVAC systems if they aren't designed for high MERV ratings. If in doubt, a local duct installer should inspect your ductwork so that you know what your system can handle.

Putting an air filter in backward can reduce airflow, which means your air conditioner has to work harder, putting a strain on your HVAC system. This can result in higher energy bills, premature repair, or even system replacement. Always check the manufacturer's guidelines to identify what is the front and back of the filter.

If you have a lot of dust in your home, an air purifier can help draw dust, pet dander, and pollen out of the air and trap it in a filter. Air purifiers are especially nice if you have allergies or lots of pets as air purifiers that use a HEPA filter can reduce allergens by up to 99.7%.

The lifespan of a whole-house air purifier or filtration system depends on several factors, but with proper maintenance, they are built to last. A whole-house system that integrates with your home's ductwork can last 10 to 15 years, or even for the entire lifetime of your existing HVAC system. To maximize the unit's lifespan, perform regular cleanings, change filters as recommended, and schedule an annual inspection to catch potential issues early. The system's longevity also depends on its frequency of use and how hard it must work to maintain your desired air quality. For comparison, smaller, portable air filter systems typically last between five and ten years.