Article Categories:
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...
by National Comfort Institute, Inc.
Hissssssssss. That's the sound nobody wants to hear when you're drilling static pressure holes near an evaporator coil. One way to avoid this awful noise on systems with gas furnaces is to measure static pressure by removing the high limit switch. In most gas...
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...
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...
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...
by National Comfort Institute, Inc.
Ever balance a job only to come back and find out the homeowner or tenant decided to "rebalance" the system for one reason or another? By marking your damper positions when the job is complete you can easily tell if they were moved and easily rebalance the system by...
by David Holt
Manage Your Most Valuable Asset by David Holt, NCI Director Sales & Service Leadership Time is your most valuable resource. Assuming you make it through the next 24 hours, you have exactly the same amount of time as the richest person in the world. The difference...
by Jim Davis
Most homes are already leaky and drafty so why would you want to bring in more outside air into the duct system? Because that's the best place to bring it in! Normally the air that comes into buildings, leaks through the walls, windows, doors, electrical outlets,...
by National Comfort Institute, Inc.
NCI training seminars show you how to achieve gross margins of up to 80% on testing and system renovation work. This should result in net profits of 20% or better. Some of you make these margins regularly on this type of work, yet many still do not. As we provide...
The Magnehelic® is the go-to test instrument for many NCI-trained technicians for measuring static pressure. This test instrument has been around the HVAC industry for decades and is still the test instrument of choice for many. In this article, we explore the basics...
