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Current Category: Airflow

Profitable Register and Grille Change-outs

Quite often we can trace airflow problems to restrictive and/or poorly performing registers and grilles. In these cases why not offer your customer a complete register and return grille change-out package. High quality registers and grilles are available from...

The Problem with Open Filter Racks

by David Richardson

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...

Outside Air Formula

by National Comfort Institute, Inc.

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...

Modern Service for Home & Business

by National Comfort Institute, Inc.

Congratulation's to November's NCI Contractor of the Month: Jim Glennon, President of Modern Service for Home and Business in Fort Meyers, Florida. The company has been in business since 1965, and is home to more than 85 employees. They perform most of their work in...

Mike Graham Heating & Air Conditioning, Burkburnett, TX

by National Comfort Institute, Inc.

Mike Graham is the owner of his namesake company, Mike Graham Heating and Air Conditioning located in Burkburnett, Texas. Mike graduated from service tech to business owner 11 years ago, and now shares his days with a dozen other HVAC professionals in his company....

Member of the Month – T.M. Johnson Bros

by NCI Staff Writer

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...

Measuring Air Flow on Spiral Duct Systems

by National Comfort Institute, Inc.

When measuring airflow in spiral ducts, it's often impossible to get a hood over the registers to read the airflow. Some systems prevent even one good hood reading to use to make a correction factor. In this situation, traverse the trunk duct serving the registers at...

Measure Fresh Air BTU Gain

by National Comfort Institute, Inc.

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...

Measure and Understand Air Flow

by Rob "Doc" Falke

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...

Measure and Persuade With Duct BTU Loss

by Rob "Doc" Falke

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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NCI Article Library

Profitable Register and Grille Change-outs

The Problem with Open Filter Racks

Outside Air Formula

Modern Service for Home & Business

Mike Graham Heating & Air Conditioning, Burkburnett, TX

Member of the Month – T.M. Johnson Bros

Measuring Air Flow on Spiral Duct Systems

Measure Fresh Air BTU Gain

Measure and Understand Air Flow

Measure and Persuade With Duct BTU Loss

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