These ducts attach to the output on your Antminer S1, S3, S5, S7
Total height approximately 2 1/8 inches.
For higher end miners you may wish to consider oour full height shroud which provides slightly less turbulence
 
When we first discovered the concept of coling shrouds for our miners, we added them to two Antminer S1 units in our 400 square foot workspace and reduced the ambient temp from 86F to 74F!
Using these on a larger scale can save you a fortune! We keep a few of these made up, but they take a while to print, for large orders it make take a few days to get them all printed.
 
Printed in bio-degradable PLA.