Recommended Duct Velocities (FPM) Duct Type Residential Commercial / Institutional Industrial Main Ducts 700 – 900 1000 – 1300 1200 – 1800 Branch Ducts 500 – 700 600 – 900 800 – 1000   As service technicians, we are often expected to understand a bit about design to diagnose a problem fully. Duct velocity has many […]

Here is another excellent article from Michael Housh, owner of Housh Home Energy and a regular contributor to HVAC School. Thanks, Michael! I thought I would go through a simple example of sizing a hydronic circulator for an application. This is a made-up scenario, but I sketched out a 20’ x 20’ square home with […]

This article is part 4 of a 5-part series on troubleshooting by Senior Refrigeration and HVAC tech Jeremy Smith Ok, so we've got our data scribbled and scratched out on paper. Maybe a bit of grease, dirt, and oil, too, if you're doing things right—blood if you're doing it wrong. Now, time to take a […]