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Our system is very different using UV (Ultraviolet) flame detectors (not smoke detectors) our systems "sees" the initiation of a flame started by a cigarette lighter or match and sounds the alarm either overtly or covertly. The covert systems alert the "enforcer", perhaps a vice principal or personnel manager that a smoker has lighted up in a particular bathroom
Let's assume that a Teacher/Staffer earns $40,000.00/Year
Working 185 days/year
That's about 45 cents a minute
If s/he checks 10 bathrooms per school building
averaging 5 minutes per bathroom
and 5 bathroom sweeps/day then
s/he's consumed 250 minutes
or about $115.00/day
If we further assume that an average complete STEALTH System costs $3000.00
$3000.00/$115.00 is 26 days or less than 6 weeks!