BestAir Extended Life Humidi-Wick EF21 Humidifier Wick Filter Pack options:Pack of 1 simply thread the elbow into

simply thread the elbow into one end of the duct (no clamp needed)

Rockwool delivers the sound absorption you want and the fire resistance you need

Locking button holds string in place

Stainless steel outer casing and inner liner

407 1/2 In

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