The double action push switch has a longer life and more design freedom for attaining desired load characteristics for first and second switching actions so that it occupies less area on a printed circuit board. The washer is secured to the collar by fastening means and the system further comprises first pre-fitting means for acting when the collar is in the non-tightened state to secure said collar to the first tube when the bearing surface of said first tube is engaged in the setback. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52. A monitor module may be coupled to the adaptive-rate sensor module, the monitor module monitoring an intrinsic chronotropic response.