The 301 Series has an adjustable depth of 18 to 28 inches, allowing it to accommodate deeper equipment than the fixed-depth 101 and 201 Series.
Both the 301 and 201 Series swing out from the wall for rear access, but the 301 Series adds adjustable-depth mounting rails (18 to 28 inches) and numbered rack unit positions to make equipment placement easier, at the cost of a smaller size range.
The 301 Series is available in 12U, 15U, 18U, and 22U sizes only — there is no 6U or 9U option in this series.
This rack provides 12U of usable rack space. Each rack unit (U) measures 1.75 inches in height, giving approximately 21 inches of total usable mounting space for your equipment.
Assembled height is 26.5 inches. The rack is 21 inches wide (19 inch internal mounting width) and has an adjustable depth of 18 to 28 inches.