A relay and a controller for the same are disclosed. A method monitors airflow through the detection device and provides a maintenance indication when the airflow has been reduced due to contamination of the dust filters. The mollusk is preferably supported on a mounting structure which facilitates quick mounting of the mollusk in the device, comprising a releasable element affixed to the shell of the mollusk, e. The extension member abuts the implant at mating flat surfaces which are spaced by a medial recess formed by a portion of the medullary canal of a long bone. As a result, in the thermoelectric device, thermal conductivity can be reduced and electric conductivity can be maintained.