To suck or Blow

Can anyone whose had any experience with cool tubes please comment. I have read that its not good to suck air from tube into fan as this can cause heat build up in fan and cause fire. Also does this mean I need 2 fans one to blow cool air through duct over light and expelled from chamber and an extractor fan to empty the air actually in chamber and replace with fresh this would also be attached to scrubber

suck for sure

Suck the air through the tube. Air creates negative pressure when sucked which sucks more air in.

Yeah! Sucking the air out creats that negative pressure that keeps everything managable.

The exhaust air from a "Cool-tube" isn't as hot as you might expect. The constant air flow keeps it down to somewhere around "warm".

thanks I guess Ill have to suck