Good filter
They seem to work fine.  They are good quality and seem to work well.  I am using them to replace the electrostatic air cleaner which is crackling and popping too much.  I unfortunately ordered the wrong size by mistake.  They were happy to accept the return post paid, even though I opened the package.  The problem was I needed to pay the shipping and the USPS new size rates made the shipping cost greater than the cost of the filters.  We told them nevermind and refashioned the filter to make it fit.  Of course, none of this was their fault.
Rating: 4 stars