FAN SYSTEM DETECTS SMOKE The VESDA Very Early Warning Smoke Detection System from Xtral now is available on Big Ass Fans. VESDA detects minute levels of smoke in the air and offers three levels of alarm with adjustable thresholds before there is visible smoke, flames or intense heat. The system then sends a signal to the fan to automatically shut down. (877) 244-3267 / www.bigassfans.com