We strongly discourage the use of duct board wyes for splitting air flow to different areas. The estimated equivalent length of a duct board wye

Charles Watson, a British school teacher in the 1850’s notices he, and his students, are repeatedly getting sick in his classroom. He reasons that the

Here is a link to an article Paul wrote for HVAC Today. It is an overview of why Manual J is so crucial to proper

Manual J is a building science related engineering calculation that helps us put value on the structure’s ability to resist the loss and gain of

Why does my air conditioning system cost so much to run when it still doesn’t keep me comfortable? In the heating and air conditioning industry,

Welcome to our new website. Stay tuned for more information about Manual J, Manual D and Manual S HVAC system design. – The Manual J