If you have a whole house Trane A/C do not buy this filter, it will not fit. The service was very good, the package arrived in 2/3 days by UPS and in good shape, not crushed. That is where the good ended because when I tried to install the filter it would not go in unless I pushed the top part of the filter down. I needed the filter so I continued to install all 27 inches of it, and it looks a little crushed. I will have to use it until I can get more filters from another source. We have a Trane model XV90 that was installed in July 2005 and this is the first time I have had any problems with filters. I guess it is the AFTERMARKET REPLACEMENT FILTER that is the problem. I know I will not buy another.