Wikipedia defines pressure drop as as the difference in pressure between two points of a fluid carrying network, in the case of HVAC the “fluid” is air and the “carrying network” is the duct system. Elements which cause pressure drop include poorly designed duct systems and evaporator coils. However, air filters also add to pressure drop. The wrong air filter size or type can add excessive pressure drop, which will cause the air handler or furnace blower to struggle, slowing a HVAC system’s ability to attain the desired temperature in the home. This can also lead to premature wear on components and robs energy efficiency. In summary, air filtration goals should be identified early in the consultation process and are critical to designing an appropriate heating and cooling system which both efficiently conditions your home but also purifies the air.
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Craig Sopo 