Oh screw it. I ended up at 35C immediately. Im returning the fan tomorrow, and getting this instead:

*TD 350/125.
*125 mm.
*50W.
*Decibel 48/39 dB(A).
*Max. air 370 m³/hour.
*Diam. 155 mm.
*Length 290 mm.
*230 V.

Thats more than twice the power.
Might as well do this properly.
.
faithlessxxx Reviewed by faithlessxxx on . Ventilation Duct Fan For COOLTUBE Question I'm hoping to use it to make a cooltube for a 400w HPS, alternatively a 250HPS. Will this do? These are the specs: TD 160/100. 2 speed: 2500/2100 v/min. Effect 35/23 W. Decibel 39/35 dB(A). Max. air: 160 m³/tim. Rating: 5