Trion air cleaner are sorted by model number. The model you need is based upon the CFM or air conditioner size you have. If you have a 3.5 ton or smaller unit a 1400 CFM air cleaner will work for you. You can still use a 200 CFM model if the dimensions of it match your ductwork better. If you have a 4 ton or 5 ton air conditioner you must use the 2000 CFM model air cleaner. Parts for all the past and present models are located on a different link which can be found in the left hand task bar of this site. If you have any questions feel free to chat on-line or call us for free assistance.