Design of a Microwave Filter

Appearance

• A microwave filter is a square or rectangular blade that slides or sets into a slot in the microwave's vent hood. Most microwave filters are between 5 and 10 inches wide and long, though dimensions vary by manufacturer and model. The outer rim of a microwave filter is a rigid metal band while the interior features a metal or synthetic mesh material to trap specific types of particles present in the microwave's exhaust gases.

Types

• There are two primary types of microwave filters: charcoal and grease filters. Charcoal filters are darker in color and feature carbon compounds that absorb odor-causing particles and very small pieces of debris in the microwave's exhaust gases. Grease filters are made of a simpler wire mesh material and prevent larger particles, including airborne grease, from entering the rest of the microwave's exhaust system. Charcoal filters are typically more expensive than grease filters, the former priced in the $15 range and the latter in the $10 range as of the time of publication.

Location

• Another major difference between microwave filter types is where they are located in a typical microwave and exhaust duct setup. A grease filter usually slides into a slot near the base of the microwave's exhaust duct, where the microwave meets the exhaust system. However, charcoal filters are located within the duct work. This means that to change a charcoal filter, you'll need to remove your microwave from its mounting position, which isn't necessary when changing grease filters.

Considerations

• Microwave manufacturers specify the frequency with which you should inspect or change filters so check your owner's manual before attempting to remove or replace the filters. Filter sizes vary from one model to another so measure each filter carefully or check the owner's manual for filter size specifications. Countertop microwaves that vent directly into the kitchen may not have filters. This eliminates the need to change them but also means that grease, hot air and food odors can enter the room more easily.