This is a legacy version of the WELL Building Standard. Please check the latest version here.

Air flush

Air flush

Intent: 

To remediate construction-related indoor air contamination.

BACKGROUND

An air flush or building flush is a technique whereby air is forced through a building after construction and prior to occupancy in order to remove or reduce pollutants, such as VOCs and particulate matter, inadvertently introduced indoors during construction. Air flushing improves indoor air quality by limiting the exposure to an intense contamination period.

Part 1
Air Flush

A building air flush is performed while maintaining an indoor temperature of at least 15 °C [59 °F] and relative humidity below 60%, at one of the following volumes:
a.1
A total air volume of 4,266 m³ of outdoor air per m² of floor area [14,000 ft³ per ft² of floor area] prior to occupancy.
b.1
A total air volume of 1,066 m³ of outdoor air per m² of floor area [3,500 ft³ per ft² of floor area] prior to occupancy, followed by a second flush of 3,200 m³ of outdoor air per m² of floor area [10,500 ft³ per ft² of floor area] post-occupancy. While the post-occupancy flush is taking place, the ventilation system must provide at least 0.1 m³ per minute of outdoor air per m² of floor area [0.3 CFM outdoor air per ft² of floor area] at all times.