static pressure

[sethuME]

hi
for the wall mountable exhaust fan how will we find the static pressure?

 

[imok2]

If it's an axial flow fan,it shouldn't have a duct attached to it these type fans don't operate very efficiently against static pressure, if it,s a squrrel type fan with no discharge duct then you have no static pressure and if you have attached duct(resistance) then I suggest you read this:

http://www.orionfans.com/html/static_pressure.html

 

[friartuck]

You don't.

Use a reliable and trustworthy fan manufacturer and that will tell you what airflow you are getting.

BUT, if you want to have some idea of airflow, use a hood.

The hood however will interfere with the readings and give you a lower airflow than it really is capable of

Friar Tuck of Sherwood

 

[CRG]

Use a manometer and place one tube on each side of the wall.


See

http://www.efunda.com/formulae/fluids/manometer.cfm

If you want to calculate it, you will need to evaluate the path the replacement air takes getting into the room. Then make a curve of dp verses air flow into the room. Overlay the fan curve and where the two lines intersect will be the calculated static pressure in the room.