Addtronics Computer Case 7896-120-90 Modification Details, p. 3
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Upper Back TT-900
installation:
To achieve high-cfm flow through, the Just Cooler Bay Cooler (aka the TT-900) can be installed in the 5.25 HD mount at the upper back of the case.
When the TT-900 is installed, the louvers in the floor beneath it can be removed. And, it usually necessitates some sort of drive column fan mounting balance the airflow for positive pressure.
NET HD CAGE
INSTALLATION: This mod is the key to providing
high-capacity internal mounting for HDs.
Four HDs can be installed here, thus making it possible to install up to six internal drives easily in the 7896.