Radiator Thermal Test Bench Progress

[DavidNJ]

I think the equation goes PV=kT or something like that. P goes down, V is constant.

You can trivially make a shroud with a spacer ($10 for a bag of 50 from McMasterCarr) and some duct tape. No harder than attaching the fan with a longer screw.

Just because some people who fasten the fan directly against the radiator in push is no reason to test that way. Those people are already giving up 50% of their cooling capacity...what difference does the radiator curve mean to them? They could improve their systems significantly by spending 30 minutes with $10 of hardware.

Update:
A better comparison would be: is it better to add a two stage fan-set to a 2-fan radiator in pull with a shroud than to go to a 3-fan radiator?