The table below indicates air change rates (air changes per hour) commonly used in different types of rooms and buildings.

Oct 11, 2024 · Learn how to calculate outdoor air ventilation rates using ASHRAE Standard 62.1 in this detailed article with examples to calculate CFM

Ventilation rates are often expressed as a volume rate per person (CFM per person, L/s per person). The conversion between air changes per hour and ventilation rate per person is as …

May 23, 2025 · Increasing the amount of outdoor air coming into the building helps to control pollutant levels, odors, temperature, humidity and other factors that can impact the health and …

Oct 3, 2024 · Learn why 5 air changes per hour is ideal and how to calculate it.

ANSI/ASHRAE Standards 62.1 and 62.2 are the recognized standards for ventilation system design and acceptable indoor air quality (IAQ). Both standards specify minimum ventilation …

Jun 12, 2025 · It relies on calculating the total volume of the space and applying a ventilation rate based on air changes per hour (ACH) or cubic feet per minute (CFM) per square foot.

Jun 11, 2025 · Ventilation rate refers to the rate at which outdoor air is introduced into a building to replace stale or contaminated indoor air. It is typically measured in cubic feet per minute …

Dec 4, 2025 · Learn the precise ventilation rate for adults and how involuntary breathing ensures perfect blood chemistry and gas exchange.

Calculate air changes per hour (ACH) for proper ventilation in buildings. Our ACH calculator helps determine ventilation rates for different room types and applications.