Premium HVAC outdoor telecom enclosures with NEMA 4/4X ratings for extreme environments. Our temperature-controlled electrical cabinets feature weatherproof, waterproof designs for 19" server racks, fiber distribution & cell tower equipment. EXAIR's NEMA 4X (IP66) Cabinet Cooler® Systems (dust-tight, oil-tight, splash resistant, corrosion resistant, indoor/outdoor service) incorporate a low pressure relief valve for both the vortex tube and cabinet air exhaust to maintain the NEMA rating of electronic enclosure. Mier offers NEMA 4X, NEMA 4, and NEMA 3R type indoor/outdoor enclosures. Trusted by telecom operators for reliable. Angle: This article addresses the critical decision of selecting the correct NEMA-rated enclosure (3R, 4, 4X) and integrating a cooling solution. It focuses on preventing the two most common failure modes: water ingress from high-pressure washdowns and corrosion from environmental exposure. The. COMPACT OUTDOOR cabinet cooling units have a protection class of IP 56 or UL Type 12, 3, 3R, 4. They have an enclosure heater and aluminium filter as a standard and separate internal and ambient air circuits. Our NEMA / UL Type 4X cooling units are designed for corrosive environments such as the. AZE's 12U outdoor enclosure with 1000BTU air conditioner is designed to house a variety of telecommunication equipment with 19" or 23" rack rails, standard features that include HVAC climate control,they can provide outstanding environment protection from vandalism, dust, rain, snow and dripping.