Westinghouse : BB2020, MU2020, NC2020 York : YMU2020, YNC2020 The Nordyne 918396 can be used to replace collection cells in second generation ("flat top") electronic air cleaner that with their cells removed have a clear opening at least 20 1/4" x 20 3/4" x 5 1/4". The Nordyne 918396 air filter can