Without the specification on your filter and fan, the answer to your question is conjecture.

As a rule of thumb, as the static pressure increases, the horse power required to overcome the resistance is equal to the square of the increase. I.E: A 10% increase in static pressure requires 100% more horsepower to overcome it.

The best way that I have found without information, is to just measure static pressure, which is easy to do with a length of clear plastic tubing. If you drill a hole in the duct and attach a length of clear hose to it, it is possible to loop it around so that it makes a vertical ??U?, add water to the hose, and see how much higher it lifts the water in one leg vis a vis the other.

1? of water column is equal to .0361 pounds per cubic inch.

My 4? Vortec fan puts out less static pressure than my 6?s, which put out about 2.32 inches of water column.

Sound is also a function of air movement and blade tip speed. A 6? running at slow speed is significantly quieter than a 4? fan running at full speed.

As just another tongue in cheek number, the cfm is directly proportional to the fan rpm, but an increase in rpm requires the cube of the increase in horsepower. Better to get a big fan and slow it down than a little one and run it close to blade stall speed to achieve the required output.