Addtronics Case 7896-120-90 - Modification Details, p. 2
Click Photo for Enlargement
Backboard 90
punch:
Here, fan guards are installed on both sides of the fan.
< APS 90
punch:
There is just enough room to overpunch the above-PS 80 chassis grill out with a 90.
This option is not always needed to maintain positive pressure in the case, but comes into use when there are 5.25 drive column intake fans or with the HD cage installation shown on the next page.
Drive column 90
direct mounting >
Two 90s are shown here, and two more 90s could be mounting. In this installation, the left side (low) 90 is an intake fan, as shown by the metal mesh filter mounted on the fan. FYI, MMFs and rubber washers make the doors bulge slightly.
(drive slides were left out for clarity in the photo detail; there is considerably less unobstructed space in actual use)