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The Aprilaire Model 400 Whole-House Humidifier features a built-in bypass damper and utilizes new evaporative technology to minimize water use. Gravity pulls water down, while the wicking action of the Water Panel draws it back to the top, using 100% of the water delivered to the unit. The Aprilaire Model H400 Whole-House Humidifier:
Unit Dimensions: 15-29/32(W) x 15-31/32(H) x 10-11/32(D)
Plenum opening: 9-3/4(W) x 12-1/2(H)
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