An adjustable flexible strap for supporting and securing ducts, or like device, and the like formed of a strap member that has a fastener strap and a pair of integral support members integrally formed in the strap. A first chip carrier is joined back to back with a second chip carrier via an insulating adhesive applied on the inactive surface of the first chip mounted on the first chip carrier and the inactive surface of the second chip mounted on the second chip carrier. The adsorber is regenerated and the adsorbtion efficiency of the adsorber is subsequently determined.