No, I mean if the fan is powerful enough. The cool tubes are around 9cm, but they're not a standard size since thwey come from second hand hurricane lamps, so will have to insulate a bit where they join the flex and fan.

Max. air: 160 m³/h.
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