Joe's tests could be conceived as misleading:
Joe:
BIP - 45cfm, 1.5gpm: 757btu/h = 222W
BIX - 45cfm, 1.5gpm: 662btu/h = 194W
Bill
BIP - 1212VHE, 1.5gpm: 230W
BIX - 1212VHE, 1.5gpm: 253W
Same old problem: presenting only half the equation.
C/W (or dissipation power) vs flow is useless without PQ.
Edit: not fully awake- there must be something more than just misleading about Joe's data??? The BIX is 40mm thick whereas the BIP is 25mm. Surely for the same air flow rate the BIX should be clearly ahead!? (Assuming same fin/tube geometry)
...
Perhaps not thinking hard enough