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Part numberHC26A1008 vs GeneralAire 990-13
adapter
HC26A1008
10 in W x 13.25 in H x 1.5 in D
GeneralAire 990-13
9.75 in W x 12 in H x 1.5 in D
HC26A1008 fits
Honeywell HE260, HE265, HE360, HE365
GeneralAire 990-13 fits
GeneralAire 709, 990, 1040, 1042, 1137, SL16

Whether the HC26A1008 and GeneralAire 990-13 humidifier pads interchange.

Same fit group, different frame. The HC26A1008 and GeneralAire 990-13 cover the same humidifiers but differ in size.
Fitment notes

The HC26A1008 and the GeneralAire 990-13 sit in the same GA35 cross-reference group and cover the same humidifier slot, but the HC26A1008 measures 10 in W x 13.25 in H x 1.5 in D while the GeneralAire 990-13 measures 9.75 in W x 12 in H x 1.5 in D.

Because the frame sizes differ slightly, seat the replacement fully against the water tray so water wicks through the pad rather than running down a gap at the edge. Either one fits the same humidifiers, but a pad that sits loose will drip past.

What to buy

Find your model

Read the number stamped on the humidifier cabinet or printed on the old pad, then match it below. Confirm the frame size before buying a generic.

Related

Sources: Resideo HC26A1008 humidifier pad (Honeywell Home) · Honeywell Home standard replacement humidifier pad · General Filters GeneralAire 990-13 vapor pad · Industry evaporator-pad cross-reference chart (2J Supply)