Expert guides, diagnostic tools, and industry insights for HVAC professionals. Interactive calculators included.
Part 3 of the HVAC Air Distribution Field Series. Now we put it together: the five residential duct layouts and where each is appropriate, how to size the airflow each room actually needs in cooling vs heating, and the energy-conservation triad — insulation, vapor barriers, and air-tight sealing — that turns a working duct system into an efficient one. NCCER-aligned, references ACCA Manual D/J and the IECC.
Part 2 of the HVAC Air Distribution Field Series. Covers every piece of hardware between the blower wheel and the register face: direct-drive vs belt-drive motors, centrifugal blowers, propeller and duct fans, the fan laws that govern what happens when you change speed, the three main duct materials, how diffusers / registers / grilles differ, and the dampers (balancing, fire, smoke) that control where the air goes. Field-tested, NCCER-aligned, in plain English.
Part 1 of a 3-part field series on HVAC air distribution. Covers what airflow and pressure actually are inside residential ductwork, how a residential distribution system is laid out from blower to return grille, and every instrument a tech reaches for when something does not feel right at the registers. Built to match the NCCER curriculum scope so it is useful whether you are studying for a credential or troubleshooting a job.