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good day,

how can i check the total external static pressure and static pressure in the equipment.

thank you


Does the equipment include the blower inside? Are we talking about a piece of air handling equipment?

If so the external static pressure would be the static pressure at the discharge of the equipment minus the static pressure at the inlet to the equipment.  The static pressures can be checked by drilling a small hole (1/8" dia.) in the duct walls of the inlet and outlet of the equipment. Then place a manometer tube over each hole (not simultaneously) to read the pressure in inches of water as compared to atmospere. Subtract the inlet reading from the outlet reading. Don't mix up your + and - pressure signs. This will give you your current external static pressure.

 In this case it would be difficult to know what the pressure drop through the unit is, unless you have a fan curve for that particular fan and rpm installed inside, or you can somehow measure the static pressure at the inlet  and outlet of the fan. The equipment manufacturer however should have that information available. If the equipment has filters inside it, this can make a huge difference in the performance of the unit, so check the cleanliness of the filters if you haven't already and you feel your unit is underperforming.

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