The Carrier 31MP414110 electronic air cleaner is a whole house air cleaner designed to be attached to the return air duct system of a home. Maintence of the Carrier 31MP414110 electronic air cleaner consists of washing out the collector cells and prefilters on a monthly basis. Ionizer wires must be replaced when they get brittle and break. There are 2 different types of ionizer wires. Both are the same length but the ends on the A style are much larger than the standard NON A style. Be sure to look at the ends of your existing ionizer wires before you order the wrong ones. The A style can be used on all units but the NON A style will not hook into place and stay in place since the ends are too small for certain manufacturing years.