STI EF181610-O3 NEMA 3R Fiberglass Filter Fan Enclosure

Overview

The STI EF181610-O3 is a non-metallic fiberglass enclosure rated NEMA 3R, designed to house access control panels, fire alarm control units, and remote annunciators in environments where moisture, dust, and vandalism resistance matter. The integrated filter fan manages internal heat buildup while the opaque door blocks casual view into the cabinet—critical when you're protecting panel logic and backup battery banks from environmental exposure and physical tampering. Made in the USA with UV-resistant fiberglass construction, this enclosure delivers environmental protection without the weight and corrosion concerns of steel.

Compatibility

The EF181610-O3 mounts standard STI access control and annunciator hardware. Door capacity rated for 7-door systems. Compatible with fire alarm control panels, remote annunciators, and electronic devices requiring NEMA 3R environmental protection. The removable door with draw-down latch and lockable mechanism integrates with standard panel-mount hardware using brass threaded inserts for secure inner panel mounting. Mounting panels are available separately to simplify installation on wall or post-mount applications.

Installation Notes

The filter fan operates at 44dB(A)—audible but not intrusive in office and lobby environments. Soft rounded edges reduce snag hazard during installation and maintenance. The enclosure supports pressure compensation vents, drain vents, and optional heating or AC systems depending on deployment climate. Brass threaded inserts eliminate corrosion at mounting points. No special tools required beyond standard fasteners; draw-down latches are tool-free for field access.