Poor airflow

Low air delivery at registers, or low measured system airflow.

Air Side

normal

Background

Duct Design and Airflow Delivery
Concept
Sizing, friction, fittings and the reasons a duct system fails to deliver what the equipment can produce.
Air Filtration
Concept
Filter ratings, the trade off between filtration and airflow, and how filters actually fail.
Static Pressure and Duct Diagnostics
Concept
Measuring total external static pressure and using it to find where a duct system is choking.
Airflow Fundamentals
Concept
CFM, static pressure and why airflow problems are behind a large share of service calls.

Related procedure

Anemometer and Airflow Measurement
Tool
Measuring air velocity and airflow at grilles, in ducts and at the equipment.

Local Code Notice

HVAC installation, venting, combustion air, ventilation air, gas piping, clearances, termination locations, electrical requirements, permits, and equipment requirements vary by jurisdiction and equipment. Always verify the applicable local codes, adopted code edition, regulations, permits, and manufacturer installation instructions before installation or service.