For the tests the entire output was restricted to about a 3" hole .... the last photo in post #62 showing the meter ... it's lying right over the top of the hole, made it the same size as the meter fan.
Actually these systems seem pretty well engineered, the fans produce more pressure than I would have guessed. Remember not to over do the sealant thickness between the housing and the firewall, the firewall provides the "back side" of the housing and if it's spaced too far out it allows too much clearance between the fan and the firewall, allowing air to recirculate ... kind of like clearancing a Pontiac water pump plate.
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