Orbit ESRE-B-2-G-2C LED Recessed Edgelit Exit Sign, Black Casing, 2 Face, Green Letters, Dual-Circuit Choose Pack:4 Pack which can move the fan

which can move the fan speed to high when activated

SKU: ELN4X-12-36W-W

Here's the clever part: they use Thermal Magnetic technology to sense when there's too much electricity flowing (more than 70 amps) or if there's a short circuit

SKU: ELB-30150-FLEX

Orbit ESRE-B-2-G-2C LED Recessed Edgelit Exit Sign, Black Casing, 2 Face, Green Letters, Dual-Circuit Choose Pack:4 Pack which can move the fanCategory Exit Signs Page J11 Features: Dual Voltage Input 120 277VAC Operation UL Listed for Damp Location Long lasting, Energy Saving LED Lamps 90 Minutes Minimum Emergency Operation (EB Only) Premium Grade Extruded Aluminum Housing Adjustable Bar Hanger up to 24 for Recessed Mount Field applied Chevrons Included UV Stabilized ultra clear acrylic Edge Lit Panel Mirror divider on double face versions Single Face Panels are Clear, Double Face Panels