Zalman TNN-300 Fanless PC Enclosure System

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Access to the interior is gained by removing two thumbscrews on the left side and pushing on the spring-loaded latch, which is not lockable despite the web site's mention of "Antitheft lock". The left panel then hinges out like a door.

Conveniently hinged left access door.

The first thing that's catches the eye is the flat power supply integrated on the inside of the hinged door. It's clear that the heatsink on the outside of the hinged door dissipates heat from the power supply. The two white sockets obviously go to output leads. Zalman did not specify, but our measurements verified that the 350W power supply is equipped with Active PFC for higher energy efficiency (not to be confused with high AC/DC conversion efficiency.)

The PSU label has a lot of information, including cautions and warnings.

The interior: Heatpipes galore.
Note offset front heatsink and grill for optional 120mm fan at "normal" PSU position.

The three aluminum ledges in the top right of the above photo are for the drives: The top one for an optical drive and the two lower ones for 3.5" hard drives. Rubber bushings ° like those in Zalman's heatpipe HDD coolers ° are used for the hard drives to reduce the vibration transfer into the case.

The blue metal parts in the photo above are actually parts of the right side (external) heatsink. They are made accessible via a rectangular hole on the wall that the motherboard bolts on to. There are six heatpipes that clamp into grooved slots on the heatsink; the other end of the "step" profile heatpipes clamp on to the CPU. This system has been very cleverly designed with 10 grooves so that the heatpipes can be positioned in different grooves as need to accommodate varying locations for the CPU on different motherboards. You'll see this more clearly in the installation photos.

There are three additional horizontal heatpipes that connect the large right heatsink to the smaller heatsink on the back. This means that the CPU heat is dissipated by the right and back outside mounted heatsinks. These remain in place always; they are not touched during installation.

The three longer heatpipes in the lower portion of the case run to the plate that is offset from the front panel. These are for VGA card cooling. Both the plate and the front panel are heatsinks for the VGA card. The photo below shows the VGA cooling heatpipes going out to the front panel where they are clamped.

Note the cables for the front panel, the side ports, and the iMon remote receptor.
The copper slotted cylinders are nuts that secure the external front heatsink.

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