Home › Models › GeneralAire 4200
What filter does a GeneralAire 4200 take?
It takes the GeneralAire GA35 Water Panel — OEM part number GA35.
GeneralAire 4200, whole-house humidifier, whole house.
Lowest verified price: $15.52 — aftermarket, 1 panel, BestAir A35 aftermarket at SupplyHouse. Free shipping on orders over $99 at SupplyHouse; a fee applies below that. Checked 2026-11-11.
Buy the GA35 on Amazon — GA35Amazon search for the exact part number (no single listing is endorsed). Amazon price is shown on Amazon; we do not quote it here.
The part, in brief
| Part | GeneralAire GA35 Water Panel |
|---|---|
| Replacement interval | Replace annually. |
| Equivalents | AprilAire 35, Filters Fast A35PR |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Genuine (OEM) 1 panel, genuine GeneralAire GA35 | $19.38 | SupplyHouse Free shipping on orders over $99 at SupplyHouse; a fee applies below that · Checked 2026-11-11 · source |
| Aftermarket 1 panel, BestAir A35 aftermarket | $15.52 | SupplyHouse Free shipping on orders over $99 at SupplyHouse; a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 1 panel, genuine AprilAire 35 (the equivalent panel for 4200/4400) | $34.95 | FiltersFast Free economy shipping on orders $99+ (lower 48); a fee applies below that · Checked 2026-11-11 · source |
Full record with every price, source and date: GeneralAire GA35 Water Panel page.
Finding the model number on a GeneralAire
Whole-house models: the model number is on the cover of the unit mounted on the ductwork. The vapor pad number (990-13, GA19) is in the manual and on the old pad's packaging.