Did you know you can test the accuracy of your equipment before you get on site? As a manufacturer, we often get tech support calls from auditors who are on site, and wondering if their equipment is providing an accurate reading. Thankfully, there is an easy way to test both your duct tester and gauge, regardless of manufacturer, before you get on site. There is, after all, nothing worse than showing up on site, and not being confident the equipment is working properly.

For your gauge or manometer, perform a simple "Field check of tubing and digital gauges". This calibration check can be completed before an important test, checking gauge accuracy to ensure it remains within original specifications. A simple procedure of connecting both channels of the manometer to each other will allow you to verify your equipment accuracy, and check the tubing for leakage and blockage because they are also a major source of testing errors.

For the duct testing fan, you can test the accuracy with a field calibration plate - a simple 5 minute check to verify the equipment. You should check your duct tester accuracy in both directions, pressurization and depressurization, and then compare with manufacturer specifications. Ideally, your fan should provide equally accurate results in both directions. Ask your equipment manufacturer for a field calibration plate, although you can test any fan on any calibration place, or you can make your own! All you need is a plate with a hole of a known size. For instructions and the full procedure go to: http://www.retrotec.com/residential/Articles.aspx.



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Comment by Franco Oyuela on July 18, 2018 at 4:00pm

The ducts that are part of central heating and cooling systems offer one of the best opportunities to increase your energy efficiency, increase your comfort, and manage your energy bills. Studies indicate that 10%-30% of the heated or cooled air is lost along with the money spent to heat or cool that air through leaky ducts.

Properly sized, installed, and sealed ductwork will make your heating and cooling systems significantly more efficient. Energy loss is not the only concern, however. Duct systems can also involve the comfort of your family, employees, tenants, or customers, as well as your indoor air quality. Testing the ducts will locate leaks or damage and focus repair work in the right areas.

A properly operating heating, ventilation, and air conditioning (HVAC) system will help reduce overall energy use especially during hot summer days when air conditioners are working harder and putting a strain on the electric system and will deliver greater comfort and cleaner air to every room.

Comment by Dan Wildenhaus on December 16, 2010 at 12:43pm

Silvie,  Thanks for sharing the procedure!

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