Happ sells some arcade fans(4.69" square x 1.5" deep) , these are die cast metal & they are a little high but i used 2 of them blowing out the top of my cab since heats rises...
below are the specs i could not imagine 8 fans that would sound like a dc3 taking off
thanks
dm
Top quality fan cools the electronics in your video game 
Industry standard size 4.69" square x 1.5" deep 
Low noise; impedance protected 
110/120V AC fan easily mounts in most equipment 
UL Approved 
Sealed ball bearing type 
Air flow 98-106 CFM ( Cubic feet per minute) 
Cast aluminum frame 
2,900 - 3,200 RPM