Frame structure for electronic equipment enclosure

A method of installing an accessory part in an electronic equipment enclosure includes: providing an electronic equipment enclosure having a frame structure that includes a plurality of interconnected vertical and horizontal frame members, wherein at least one of the horizontal frame members includes at least one T-slot channel and at least one recessed groove extending a length thereof, the at least one recessed groove including a row of mounting apertures arranged therein; providing an accessory part including a recessed area and an elongate opening arranged in the recessed area; positioning the accessory part such that the recessed area is aligned within the at least one recessed groove; and arranging a fastener through the elongate opening of the accessory part and a selected one of the mounting apertures of the at least one recessed groove such that the fastener does not protrude beyond an outward-facing surface of the accessory part.