What size air filter does the Rheem RH1T4821MTANA take?

The Rheem RH1T4821MTANA has no filter inside. Its filter is in the return grille or the stand, and is sized by that.

Rheem RH1T4821MTANA air filter size

Filter sizeNo filter inside

The Rheem RH1T4821MTANA is built without a filter rack, so its filter sits somewhere in the return: behind a grille on a wall, ceiling or closet door, or in the stand the unit sits on. That filter is sized by the grille or stand, not the unit. The size is printed on the old filter's edge.

If it sits on Rheem's own filter base, that base takes a 20×20×1 filter.

Shop 20×20×1

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 RH1T4821MTANA. This page also covers RH1T4821MTANAA. 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.