I'm not usually so happy about sharing photos of my jack-leg setup.... but I'll bend my rules a bit and do some show and tell.
A simple fan sucking out the top of my grow tent... pardon all the junk.
A fan blowing down my CoolTube that exhausts outside. It sucks air from inside the bloom area and forms part of my extraction.
The view from above. Sucks air in from the outer shed and forms more of my extraction elements. The pieces of silver insulation keep the airflow running over the outside of the CoolTube keeping the hottest part of the housing at about 106f.
There are many other fans... ones in the veg and bloom area just keeping air moving. Both exhaust and inlet fans on either side of the outer shed. AC air. A fan blowing air directly over the ballast and other electrical bits. Below you can see an outer shed exhaust fan as well as the CoolTube exhaust.
Yup... a fine example of some serious jack-leg engineering.