21x21x4.5 Accumulair Replacement Filter for Ruud

Replacement for OEM Part/Model Numbers: RXHF-E21AM10 and RXHF-E21AM13

Product Features:

• Nominal Size: 21x21x4.5
• Actual Size: 20.75x20.75x4.38
• No assembly required.
• Easily inserts into and out of existing return grille.
• Lasts Up to 6 Months