The THORN IHN-135 Heat Detector is a brand new analog, addressable 135 degree heat detector designed for industrial and commercial facilities. With a total of 13 units available for fast shipping, this addressable heat detector from Thorn Automated Systems is compatible with GRINNELL AUTOCALL TFX 400 TFX 500 & TFX 800 fire alarm systems. AKA SIMPLEX GRINNELL This unit is a single heat detector with a model number of THORN IHN-135, perfect for detecting and responding to temperature increases to prevent potential fires. Buy with confidence we have been on eBay for 23+ years with 100% positive feedback thank you
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