Indoor Fan help

[stonehead]

currently using a rhino 5 inch thermostat fan which is good but not quite good enough, so I ordered a 6 inch rhino single speed but got sent a systemair L1, says 720m3 but but all online says 660 odd.
Should I get the rhino that I ordered which is rated at 760m3, or stick with the Rvk? Both 6 inch

 

[onlyin420]

what is the price difference and what size is your room? If the Rhino cost more then I would certainly request it

 

[stonehead]

The rhino was on special and it's in a 1.2x1.2 with a 600w hps, not so much about the price but they was doing the rhino for 70 on introductory and sell the Rvk for 75 but I have to buy wire for the rvk