These metal pre-filters fit into my Honeywell electrostatic air filter unit perfectly! I really like the tensioned clips at the one end that makes them fit more tightly and more snug than the old pre-filters ever did. And these are the perfect size replacement for my Honeywell air filter unit. Can be easily removed, rinsed with tap water, and put back into service. I bought these because my old filters were too worn out and falling apart and I wanted to get replacements while I still could. Highly recommended.
