Hi All, I need to replace the air filter in my WaterFurnace Envision and the filter is sized 28x30x2. Lowes or Home Depot do not carry those sizes and no other hardware stores do either. Amazon.com has one filter, but the actual size is half inch less on all sides, which will make large gaps all around. I googled 28x30x2 but didn't find anything useful. WaterFurnace web site is also not very useful. I e-mailed them , but in the mean time I was hoping that existing WaterFurnace owners would help me out and tell me where you guys buy replacement air filters. Thanks! Update: I don't know how to delete my posting - I found a lifetime cleanable custom filters at JeffOtto.com $130, not bad.