if i did the calculation rght the fan you got is about 91cfm at the high speed. that is about the same as the fan i 1st tried to use with my 400hps before i upgraded. as i said it works but not as good as a cooltube should with a more powerful fan on it. i got through a grow with it without problem before i upgraded. this is what i upgraded to it's only 15bucks more than the 1 you linked. Ecoplus 465 CFM Industrial Grade Blower - Plantlighting Hydroponics
justaseed Reviewed by justaseed 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