I should mention I have a fan that can move air out the companion way and a 4" rule
inline blower that can move air out the porthole when appropriate.
But I would like to maximize use of the Air-only ventilator I have installed.
Here's the specs
Air flow Ø 65, mm Cut-out Ø 95, mm
Free flow area 24 cm2
Dimensions 68 x 230 H x W, mm
So with the construction there is a lot of restriction in flow so I feel I need a high static pressure fan. But how high? The higher the pressure than either the higher the energy use or the lower the flow. I'm sure there is a point where the optimal flow vs pressure for this type of vent is met resulting in the most possible flow for the least energy possible. But without a flow measuring equipment
and a plethora of fans to test I have no idea where to begin how much flow should I shoot for? 80, 100, 150, 30?
Energy used I would like to keep it under 3a on a 12v system. But striking a balance is more important to me. For example if I could get 90cfm for 2a or 85 cfm for 1a, well I would go for the 85cfm.
I mean there's no point in putting a 3a 90cfm centrifugal blower if It only moves 75 cfm and a 1a 65cfm axial turbine fan gets all 65cfm through.
I hope this makes sense.
Your probably thinking what's the big deal, but when it's cold, windy, pouring outside and were cooking below, the cockpit
clears are down or there's people up in the cockpit
and we don't want to blow all the cooking byproduct up to the cockpit. Well having a good source of foul weather ventilation would make a world of difference.
Sorry about the long wordy post. :-/