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3U server case has max 11 internal 3.5” or 10 x 3.5”+ 1 x 2.5" internal HDD bays when using mini-ITX M/B, has max 7x3.5 when using micro ATX M/B
M/B size: Micro-ATX 9.6 x 9.6 / Mini-ITX 6.7 x 6.7
2 x120mm + 1 x 80mm fan infront pre-installed+2 x 60mm fan at rear (option）
Material: Front Bezel+ handel Aluminum; Main Chassis- Zinc-Coated Steel
2 x front access USB 3.0 (compatible with USB2.0)
Supports standard PS2 ATX PSU with top120mm fan or side 80mm fan both are OK
Case type: 3U rack mount
3U rack mount chassis depth=400mm not includle handle

Product Description

1) Support ATX PSU with top/bottom 120mm cooling fan

2) Support ATX PSU with side 80mm cooling fan

1) When using mini itx M/B support max 11x3.5"

2) When using Micro ATX M/B support 7x3.5"

When using ATX M/B, it is under the PSU so maybe some components on the M/B

will Interference with PSU.