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High-Performance HVAC Resources

Current Category: Airflow

The Problem with Open Filter Racks

A common installation encountered by many Performance-Based contractors is the use of open filter racks. Open filter racks are installed to allow for easy filter access by exposing an inch or so of the filter. The problems with this accessory are that it creates a...

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Outside Air Formula

Some field test conditions do not allow for accurate or convenient measurement of outside air CFM. But the percentage of outside air can be calculated using three simple temperature measurements. OAT - Outside air Temperature. This is the temperature of the air...

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Member of the Month – T.M. Johnson Bros

Member of the Month - T.M. Johnson Bros Statistics tell us that the majority of new businesses fail in their first five years of operation, and only about 1 in 4 make it past the 15 year mark. So, for a company to beat the odds and not only survive, but thrive, for 50...

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Measure Fresh Air BTU Gain

Have you ever found an economizer with the louvers screwed closed or the linkage disconnected? There's a reason for that. There are days in the heat of the summer when the heat load of the fresh air makes it impossible for the system to keep up. The logical and...

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Measure and Understand Air Flow

Accurately measuring fan airflow is a critical, yet illusive test that is key to diagnosing the performance of any HVAC system. Our industry poses many methods of finding this essential number, some are great, some are good, and some test methods are purely...

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Measure and Persuade With Duct BTU Loss

The key benefit of measuring airflow is to show a customer the negative effect that a duct system can have on a piece of heating or cooling equipment. The success of a sales opportunity depends on how well we can help the customer understand how the duct system is...

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