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What filter does a Honeywell HUL520 take?

None — this model has no replaceable wick or filter.

Honeywell HUL520, ultrasonic humidifier, tabletop, sold as the MistMate.

Filter-free cool-mist design — no wick, filter or cartridge to replace.

Finding the model number on a Honeywell

Model numbers are on the bottom of the base or on a sticker on the back of the tower. The letter at the end is the color: B = black, W = white (for example HEV615B is the black tower, HEV615W the white one). Filter letters: A = HAC-504, T = HFT600, R = HAC-504AW-class refill.

This entry exists so the answer is complete: if a store tries to sell you a replacement filter for this model, it is not a manufacturer part.