Old 11-13-2020, 10:03 PM
  #11  
jester_s1
Moderator
 
Join Date: Dec 2006
Location: Fort Worth, TX
Posts: 7,136
Likes: 0
Received 21 Likes on 18 Posts
Default

I'd actually explain it backwards from what Invertmast said. 3/1 exit to entry will still give you enough flow with a marginal design, whereas good baffling and having the only air intake at the cooling fins lets you get away with less exit.