Why You Should Measure Static Pressure on Every Service Call
One of the best diagnostic tools an HVAC contractor has at their disposal is a static pressure reading. Static pressure is a measurement of resistance to airflow in system equipment and ductwork, and a high pressure reading is a clear indicator that something is wrong within the system. HVAC contractors should measure static pressure with a manometer or magnehelic gauge as part of a regular routine.
Understanding Static Pressure
An easy way to explain static pressure to customers is through a blood pressure analogy. Every medical exam includes a BP reading because it gives the doctor a baseline of the patient’s overall health and can indicate underlying health issues. Just as high blood pressure is bad for your heart, high static pressure is bad for your heating and cooling system.
In a system rated at 0.5” of water column, a corresponding static pressure can be equated to a normal blood pressure of 120/80. A static pressure reading of .75” in this same system would mean that airflow is restricted by a factor of 1.5, or the BP equivalent of 180/120. A measurement of 1.0” – twice as high as what it should be – would be akin to a blood pressure reading of 240/160, an extreme condition that would warrant immediate admission to a hospital. Conversely, low static pressure, like low blood pressure, is a trouble sign, as well.
Why Does Static Pressure Matter?
Once a customer has a basic understanding of static pressure, a technician can explain how ductwork problems and improper airflow can be detrimental to their HVAC system. Air flow restriction makes the unit work harder, which compromises system efficiency, raises utility bills, causes poor air distribution, and renders the system incapable of keeping up on extremely hot or cold days. Starved, overworked HVAC equipment is highly prone to frequent breakdown and premature failure. Even the most expensive, cutting-edge, high-efficiency equipment will never perform to its potential if improper airflow is an issue.
Expanding Your Opportunities: Duct Renovation & Holistic System Repairs
Common issues that cause high static pressure can include undersized return systems, duct blockage, closed dampers, improper transitions, offsets, and undersized or kinked flex duct. Low static pressure can result from leaking ducts or plenums, missing filters, low fan speed, or separated ductwork. If you’ve been successful in your communications, people who understand the ramifications of airflow problems are highly receptive to correcting the root issues hindering their system.
About E.P. Homiek
E.P. Homiek Sheet Metal Fabrication & HVAC Supply, with two convenient locations in Lakewood, NJ and Union, NJ, provides one- to two-day turnaround on all residential and light commercial ductwork, as well as one- to two-hour emergency fabrication service, rapid delivery, and competitive prices. HVAC parts, supplies, and equipment lines include Goodman, Honeywell, Bryant, Bradford White, Crown Boiler, Daikin, Weil-McLain, Sea Breeze, Generac, Fantech, ZM, A.O. Smith, Hart & Cooley, Malco, Mueller, and many more.
