Tender For air filter for fresh airventilationsystem to rwf drg no. rwf/sk/mw/-455. n ote:1) the tenderer shall be a reputed air filter manufacturer and have supplied air fil ter to the other firms with proven performance documentary evidence for atleast tw o recent supplies should be furnished. 2) the supplier is required to submit the materia l test certificate for the parameters specified in the drawing along with the supply. ]