Honeywell 4074ETH Air Flow Sensor Board (Round Pin Connector Style). Honeywell air flow sensor board for various electronic air cleaners. This model has round individual sockets on the ends of each wire and is designed to be interfaced with the old style mother boards. Air Flow Switch for model F50F F52F F58F Series One. The black plastic case measures approx 3½" square, wire length 10". Includes 2" of clear ¼" OD tubing. This AFS has the 4 individual pins. Compatible with power supplies manufactured before 1998. Used in models having two cells adn replaces 202121B.
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