Check your current filter. The easiest way to find the size you need is to look at the filter that's already inside of your ...

You do know you are supposed to change your furnace filter don't you? Let me back up a step. You do know your furnace has a ...

electro-statically charged high-performance furnace filter. All other options, from a four-inch-thick mechanical air filter to an electronic filter plate system, require electrical or ductwork ...