A support for pipes and conduits inside an air plenum. The support has a first end adapted to fasten to a support structure inside an air plenum of a building. The support has a second end adapted to fasten to at least one elongated member, and a connector connecting the first and second ends. At least a portion of the first and second ends and the connector are made of a plastic material with an ASTM E-84 rating of about 25/50 or better, and preferably made of PVDF.