Best Purging Systems combines Type Y & Z Purging and Pressurization Technology into a single unit to make acquisition and use simple. When utilized in Division 2 / Zone 2 Classified Hazardous Locations, our units are certified to reduce the hazardous location rating inside your protected enclosure from Division 2/ Zone 2 to non-hazardous. This allows the use of non-rated equipment in Division 2/ Zone 2 areas. While seldom required, when utilized on Division 1 / Zone 1 Classified Hazardous Locations, our units are certified to reduce the hazardous location rating inside your protected enclosure from Division 1/ Zone 1 to Division 2 / Zone 2. This allows the use of Division 2/ Zone 2 equipment in Division 1/ Zone 1 areas.

Best Purging Systems Type Y and Z Pressurization Units are manufactured in three sizes to accommodate various protected enclosure volumes. The Model 101A features a 1/4” enclosure pressure supply regulator, while the Model 101B and 101C feature 3/8” and 1/2” supply regulators, respectively. As regulator size increases, capacity to hold the required safe pressure is increased. As rated, Model 101A is suitable for a total enclosure volume of 2 Cubic Feet in Class I Areas and 10 Cubic Feet in Class II Areas. Model 101B is suitable for volumes not exceeding 50 cubic feet in Class II Areas, and Model 101C is suitable for volumes not exceeding 250 cubic feet in Class II Areas. In all instances, total volume may not exclude any volume consumed by internal equipment.

The Best Purging Systems Classified Rating distinguishes the exact purpose of the Model and indicates the Class or Classes, as established by the National Electric Code, Article 500. Class I Areas are considered as areas that may contain flammable concentrations of gases or vapors. In this instance, it is imperative to purge a protected enclosure to eliminate such potential concentrations before applying power to unrated devices within the enclosure. Class II Areas are considered as areas that may contain ignitable concentrations of airborne particles, dust or fibers. In this instance, it is imperative to clean a protected enclosure to eliminate such potential concentrations before applying power to unrated devices within the enclosure.

Best Purging Systems uses this segment to specify whether an enclosure pressure loss alarm switch is integrated with your unit, and if so, what electrical classification rating it meets. Universal Units are sold without an integrated switch, and thus require the “L” designator. Best Purging Systems offers Model EPSK Explosion Proof Pressure Switch Kits which may be mounted separately either internal to or external to the protected enclosure to activate an audible or visual alarm when required. “W” indicates the integration of a Class I or II, Division 1 or 2 Group C, D, E, F & G rated pressure switch for Horizontal and Vertical Mount Units. “B” indicates the integration of a Model 101A Class I Division 1 or 2 Group A, B, C & D rated pressure switch for Horizontal and Vertical Mount Units..

Best Purging Systems provides Type Y and Z Purging and Pressurization Units in three configurations. The Universal Mount Units have symmetrical dimensions, and may be flange mounted on any side of a protected enclosure. In addition, since they do not feature an integrated enclosure pressure loss alarm switch, they may also be mounted through any surface or door of a protected enclosure with the addition of a Model PMGK Panel Mount Gasket Kit. Our Vertical Mount Unit may be mounted on the left of right side of a protected enclosure, and is our most popular model due to its overall convenience of use. However, to ensure maximum flexibility, we also offer Horizontal Mount Units for the top or bottom side of your protected enclosure.