Picking the right headerbox fan

We put four popular headerbox extract fans to the test. They all claim to do the job but can they perform under pressure. Take a look

[joelhardeman]

Is the far left one a Luna Quiet Boost 250 or something else?

[zxhoon]

Noise, power stats on each one? scientific testing you need to keep the tubing the same, as bend radius changes so does pressure on the fan.

[Encom]

As a HVAC Cx Engineer - oh dear. Come on Fantech its not that hard to come up / build a better test rig to get your point across.