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What filter does a AprilAire 550 (AprilAire) take?
It takes the AprilAire Water Panel 10 — OEM part number 10.
AprilAire 550 (AprilAire), evaporative humidifier, whole house.
Lowest verified price: $15.98 — 1 panel, genuine AprilAire #10 at Home Depot. Home Depot shipping/pickup terms at checkout. Checked 2026-11-11.
Buy the 10 on Amazon — 10Direct link to the verified Amazon listing for this part. Amazon price is shown on Amazon; we do not quote it here.
The part, in brief
| Part | AprilAire Water Panel 10 |
|---|---|
| Replacement interval | Replace at least once per heating season. |
| Per change | One panel per change. Note: one Home Depot reviewer reports the panel runs short in the 500M despite the listing — check the model list on the box against your unit. |
| Equivalents | GeneralAire GA10 |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Genuine (OEM) 1 panel, genuine AprilAire #10 | $15.98 | Home Depot Home Depot shipping/pickup terms at checkout · Checked 2026-11-11 · source |
| Genuine (OEM) 2-pack, genuine AprilAire #10 ($17.48 per panel) | $34.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 2-pack, genuine AprilAire #10 | $19.00 | Home Depot Home Depot shipping/pickup terms at checkout · Checked 2026-11-11 · source |
Full record with every price, source and date: AprilAire Water Panel 10 page.
Finding the model number on a AprilAire
Whole-house (furnace-mounted) models: the model number is on the humidifier cover or the side of the cabinet mounted on your ductwork. The water panel number (10 or 35) is printed on the old panel's frame.