Rheem RF1PY2421STANSJN00 air filter size

Filter size20×20×1

The Rheem RF1PY2421STANSJN00 takes a 20×20×1 filter in its built-in filter rack.

Is this your unit?

The model number is on the label on the side of the unit or inside its front panel. It starts with RF1PY2421STANSJN00. This page also covers RF1PY2421STANSJN00417, RF1PY2421STANSJN0041L, RF1PY2421STANSJN00L. Also sold as Ruud.

Not sure? Take a photo of the label and we'll read it for you.

If your filter isn't in the unit

Many closets have the filter behind a grille on the door, wall or ceiling instead. That one is sized by the grille, not the unit. The size is printed on the filter's edge, or you can photograph it on our home page.

Size from Rheem's product specifications. If it doesn't fit, our fit guarantee sends a new one free. Caliper isn't affiliated with or endorsed by Rheem.