The Carrier 31MP electronic air cleaner is a whole house air cleaner designed to be attached to the return air duct system of a home. We stock parts for the Carrier 31MP114110, 31MP144110, 31MP213100, 31MP220100, 31MP220110, 31MP414110, and 31MP514110. Maintence of the Carrier 31MP 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.