The Heavy-Duty MR is the toughest Disposable Pre-Filter on the market today. It is made of Non-Woven Polyester media, pleated with metal grid backing and bonded to a rigid, heavy duty, moisture resistant 52 point die-cut frame. It comes with weep holes for moisture drainage. The Heavy Duty MR is designed for coastal and high humidity applications, and has almost twice the service life of standard disposable pre-filters.
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