80mm Fan Mount For 2U 40" Rack

These models can be used to mount 4 x 80mm fans.
It requires following items.
 

9 X M3 heat inserts

5 X M3 8mm screws

4 X M3 6mm screws

1 X Noctua NA-FC1

1 X Noctua NV-FH2

4 X Noctua NF-A8