Review on Honeywell FC100A1011 Furnace Filter Replacement by Patrick Burns

Finally, the 20 x 20 x 4 filter that actually fits the advertised size is actually slightly larger. I was looking for a replacement electronic filter for my old Honeywell F50E electronic air purifier. My HVAC specialist said to measure the electronics and buy a pleated filter that size. The elements have dimensions of 20 x 20 x 4.4. I ordered a Filtrate 20x20x4 filter and when I put it in there was plenty of room. he was TOO small. It turns out the actual dimensions are 19-3/8 x 19-3/8 x 3-5/8. This Honeywell filter is absolutely true to size and fits perfectly. I no longer have to worry about cleaning electronic components.