An air cleaner (10) includes a housing (12) having a first section (14) and a second section (16). The first and second sections (14) and (16) are rotationally adjustable relative to one another. Alignment teeth (42) and (60) engage one another to position the two sections (14) and (16) relative to one another. Buckle type clasps (60) engage a ridge (44) to cam together the sections (14) and (16) and lock them in sealed engagement. A mounting bracket (80) includes a somewhat flexible band (82) which extends around the housing (12). The band (82) includes raised block portions (88) extending radially inward and spaced about the inner surface of the band (82). The housing includes a locking portion (30) having recesses formed therein which are spaced and aligned to receive raised block portions (88) of the mounting band (82). When the bracket (80) is placed around the housing (12), the raised block portions (88) engage the recesses of the lock portion (30) and the bracket (80) is held in place. If rotational adjustment is needed between the bracket (80) and the housing (12), the band portion (82) is flexed outward so that the raised block portions may disengage. The band (82) is then unflexed to retain the bracket (80) in its new position.