Protech D4120 4-Wire Photoelectric Duct Smoke Detector
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<b>[Product Information]</b><br>
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<li>Plug-in sensor offers superb false alarm immunity and the latest sensor technology</li>
<li>Increased wiring space with a newly added 3/4 in. Conduit knockout</li>
<li>One easy-access test/reset button and improved LED status</li>
<li>Patented interconnect feature for multi-fan shutdown</li>
<li>New high contrast terminal designations</li>
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