Air changes per hour
The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation. Also called air change rate or air exchange rate. Abbreviated ACH or ac/hr.
Related Links
Room ventilation needs help determine CFM
How do I calculate Air Changes per Hour (ACH)?
Calculation Worksheet: Air Changes Per Hour
Air Change Calculator – Abatement and Remediation Work
Role and Calculation of Air Changes per Hour in Clean Room Area : Pharmaceutical Guidelines
Related Videos

Energy Audit Part 10 Air Changes Per Hour

Home Ventilation & Indoor Air Quality

Use the Air Changes Calculation to Determine Room CFM

HVAC: "Industrial Ventilation: A Practical Overview" 1991 Occupational Safety & Health Admin

venting systems and air change per hour GCE42.com General Contractors B Building Exam Top Words

Air Ballance HVAC 29-0

Titus Timeout Podcast - Air Changes per Hour
Energy Audit Part 10 Air Changes Per Hour
Home Ventilation & Indoor Air Quality
Use the Air Changes Calculation to Determine Room CFM
HVAC: "Industrial Ventilation: A Practical Overview" 1991 Occupational Safety & Health Admin
venting systems and air change per hour GCE42.com General Contractors B Building Exam Top Words
Air Ballance HVAC 29-0
Titus Timeout Podcast - Air Changes per Hour