What is the maximum storage capacity this device can handle?

The maximum storage capacity this device can handle is 120TB.

Does this enclosure have any cooling features?

Yes, the enclosure features a smart fan function with a built-in thermal sensor for cooling.

Yes, this hard drive enclosure supports both Microsoft Windows and Apple OSX operating systems.

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5 Bay USB 3.2 Type-C 10Gbps Daisy-Chain Hard Drive Enclosure DAS, Support 120TB (5x 24TB) 2.5" & 3.5" SATA HDD/SSD - SY-ENC50128

5 Bay Hard Drive Enclosure.
Ultra-Fast USB3.2 Gen2 10Gbps Connectivity.
Supports all brands of 2.5" and 3.5" SATA I/II/III hard disk drive up to 24TB per drive with a maximum support of 120TB.
Smart Fan Function with built-in thermal sensor support.
Supports daisy chain feature via USB Type-A.
Supports UASP.
Software Raid Support: RAID 0, RAID 1, RAID 3, RAID 5, Raid 10, SPAN, and JBOD.
To ensure compatibility with your computer system, the SY-ENC50128 supports all of the leading operating systems, including Microsoft Windows (10/8/7/Vista/XP/Server 2016/Server2012/Server 2008/Server 2003), Apple OSX (10.9+/10.8/10.7/10.6), Linux, and Google Chrome OS.
The tray-less design provides a simple way of HDD removal and installation – simply pull the handle to insert or withdraw the HDDs.