This is the alarmed cabinet fan assembly for the the PM, APM, and HPM cabinet. It contains two fans and a speed monitoring / alarm circuit.

WPC recommends that you do not buy this assembly as a used assembly. We routinely see fans with more than 20 years of continuous operation on them, and a questionable amount of lifetime left. The fan used on this assembly is a high-quality all-metal ball-bearing fan with a speed-monitoring sensor built in. We install NEW fans, the same as the original fans, on every HPM cabinet fan assembly that we sell.