How to Replace Furnace Filters. Get the right replacement. Transfer Exchange Contacts To Sim Iphone Va. Furnace filters are sold at home centers, hardware stores, and online. Next time your forcedair gas furnace acts up, perhaps one of these basic troubleshooting tips will save you a service call. Plus well show you some maintenance. Bearnard isnt the only one who has experienced problems when replacing an air filter. We have all experienced it at some time or another. Dont just sit there scratching your head, find useful info on Heating Cooling Repair on eHow. Get essential tips and learn more about everything from How to Fix. Disposable ones are typically 1 or 2 inches thick. Check our Ratings of furnace filters, also known as whole house air filters, for a right sized model that was effective at removing dust, pollen, and smoke when air passed through it at both high and low speeds. We also test thicker furnace filters, some up to 5 inches, and they often provide superior air cleaning. But if your furnace isnt already equipped to handle a thicker filter, it will need to be modified by an HVAC professional. Our top rated 5 inch furnace filter is the Lennox Healthy Climate Carbon. Clean 1. 6,1. 00. For 1 inch furnace filters, we recommend the Filtrete Healthy Living Ultimate Allergen Reduction 1. A45B495A63B140C7D27BD03BF283553633A3F3' alt='How To Install Furnace Filter Air Flow Direction' title='How To Install Furnace Filter Air Flow Direction' />Install the furnace filter so the arrow is pointing toward the evaporator coil, blower motor, and fan, which are located inside of the air handler. MPR,2. 0. For more choices and sizes, see our full Ratings and recommendations of furnace filters.