FiltersDex

What filter/pad fits a Generalaire Williamson 500 humidifier?

The Generalaire Williamson 500 humidifier uses the 990-13 replacement furnace/whole-house water panel.

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Key takeaways

  • Replacement part number: 990-13 (Generalaire).
  • This is a furnace/whole-house water panel, not a portable-unit wick.
  • Replace once per humidifying season, or sooner if it's visibly scaled or discolored.
  • A cheaper aftermarket filter can fit the same slot - check reviews for real-world fit before buying.
Water Panel990-13Generalaire
Furnace water panel

Buy the water panel for your Williamson 500

Generalaire 990-13The exact water panel.Shop 990-13 Cheaper water panel that fitsAftermarket water panels fit the same slot for less - check reviews for real-world fit before you buy.Shop compatible water panels

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Also known as

The 990-13 replaces (and is cross-referenced under) these part numbers: 7002.

Also fits these humidifiers

Generalaire 1037rGeneralaire 1040Generalaire 1040lhGeneralaire 1040rGeneralaire 1042Generalaire 1042-lGeneralaire 1042-lhGeneralaire 1042rGeneralaire 1137Generalaire 709Generalaire 709-rGeneralaire 709lGeneralaire 990Generalaire sl-16Generalaire sl16

Filters for the rest of your home

FiltersDex covers the exact replacement filter - and what it removes - across every appliance:

Refrigerator filterswater + air, by fridge modelAir purifier filtersLevoit, Coway, Honeywell, WinixVacuum filtersShark & Dyson, HEPA + foamUnder-sink & RO systemsAPEC, iSpring, Pentair - NSFWater pitcher filtersBrita, PUR, ZeroWater - NSF

Frequently asked

What filter/pad fits a Generalaire Williamson 500 humidifier?

The Generalaire Williamson 500 uses the 990-13 (Generalaire 990-13 Evaporator Pad), a furnace/whole-house water panel.

Is the 990-13 a wick or a furnace pad?

The 990-13 is a furnace/whole-house humidifier water panel, not a portable-unit wick.

How often should I replace the 990-13?

We don't have a manufacturer-listed replacement interval for the 990-13 - a common default is once per humidifying season, or sooner if it's visibly scaled or discolored.

Should I buy the OEM filter or an aftermarket one?

The genuine Generalaire 990-13 is the safe, exact-fit choice. A cheaper aftermarket wick or pad can fit the same slot too - check reviews for real-world fit and how well it wicks water before buying, since humidifier filters aren't independently certified the way NSF-listed water filters are.