STI EF181610-O2 Fiberglass Heated Enclosure with A/C

Overview

The EF181610-O2 is a NEMA 4X fiberglass enclosure with integrated radiant heating and air conditioning designed to protect electronic control units and access-control hardware in freezing or harsh outdoor environments. This unit solves the problem of LCD displays freezing, condensation formation, and component failure in unheated loading docks, cold-storage facilities, parking structures, and outdoor equipment racks where ambient temperature drops below freezing. The radiant heating plate maintains interior temperature above the frost point, allowing you to deploy electronics safely in zones where standard enclosures would fail.

Compatibility

The EF181610-O2 integrates with STI access-control enclosures and protective housing systems. It pairs with STI lock bodies, strike mechanisms, and external keypads or pushbuttons requiring environmental protection. The opaque polycarbonate variant (this model) blocks visual access to internal components while providing the same thermal and impact protection as transparent versions. Verify your existing strike, latch, or solenoid valve footprint against STI documentation before ordering — the enclosure accommodates standard 12 VAC/VDC, 16.5 VAC/VDC, and 24 VAC/VDC control modules and heated components.

Installation Notes

Mounting hardware and weatherproof seals are included. The enclosure operates across -40°F to 250°F polycarbonate material temperature range. Three integrated thermostats regulate heating: a primary control thermostat, a safety high-temperature thermostat (overheat cutoff), and a secondary safety sensor. Accepts 12, 16.5, or 24 VAC/VDC input for the heating element — confirm your available power supply voltage before installation. The external key lock or thumb latch (model dependent) requires no special wiring. For freezing climates, verify that your control voltage source remains live during power-loss events, or add an uninterruptible power supply (UPS) module to maintain heating continuity.