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This two wire smoke is used for a loop of up to 20 smokes on the zone specific part of the panel, while the four wire (4WT-B) gets wired to any zone.
System Sensor's i3™ series smoke detectors represent a significant advancement in conventional detection. The i3 family is founded on three principles: Installation ease, Intelligence, and Instant inspection.
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The Smartest DIY Home Improvements
