STI EP181611-O3 NEMA 3R Filter Fan Opaque Polycarbonate Enclosure

Overview

The EP181611-O3 is an opaque polycarbonate filter fan assembly rated NEMA 3R — designed to mount on access control and security enclosures that sit in outdoor or semi-outdoor environments. It pulls ambient air through a replaceable filter element to prevent dust, insects, and moisture from entering the cabinet while maintaining passive thermal management. Use this when your outdoor panel, reader interface, or control box needs continuous air exchange without compromising IP ratings or weather resistance.

Compatibility

The EP181611-O3 integrates with STI EnviroArmour® product lines and other standard access control enclosures that support filter-fan mounting. Verify mounting hole patterns and electrical connection points on your specific cabinet before ordering. STI provides mounting templates and integration guides for their standard panel families — contact the manufacturer for exact SKU compatibility if your enclosure is not an STI product.

Installation Notes

NEMA 3R rating means this unit handles rain, sleet, and external icing but is not submersible — install in wall-mounted or pedestal positions where water does not pool. The opaque polycarbonate reduces internal glare and UV transmission. Ensure adequate electrical supply and grounding at the mounting location. Replace filter elements seasonally or when visual blockage occurs — a clogged filter reduces airflow and cooling efficiency. The unit operates continuously in outdoor conditions; plan for thermal cycling and seal all cable entries to prevent condensation ingress.