Active Carbon Filter (for 40x40x10 Fan)

This is an assembly that utilizes a 40x40x10 fan and configures an Active Carbon Chamber to remove harmful gases.

Pats Lists
-1AB 2 (1A/1B, inlet/exit fan-toot)
-2AB 2 (2A/2B, Medium Duct)
-3AB 2 (3A/3B, Chamber filter)
-4AB 1 (4AB, Activated Coal Chamber)

And need 16 long screws (M3, 18mm or more).