Most disposable air filters last three to 12 months ... The 5-inch-thick Lennox Healthy Climate CarbonClean 16 lasts about 12 months, while the 1-inch Filtrete MPR 1900 needs replacing every ...

who oversees CR’s air filter testing. But not every HVAC system can accommodate a thicker filter—the most common size is 1 inch thick—though you can retrofit the ductwork of some systems to ...

Today, Woosh Air’s filters are available only in 1-inch thicknesses, but a Woosh representative said the company has 3D-printed spacers for HVAC systems that use thicker filters. These ...