Minimize the introduction of construction-related pollutants into indoor air, remediate construction-related indoor air contamination for human health and protect building products from degradation.
Mitigate Construction Pollution
For construction occurring after project registration, at least three of the following requirements are met:
Projects meet one of the below:
- Ducts are sealed and protected from possible contamination during construction.
- Ducts are cleaned prior to installing registers, grills and diffusers.
If permanently installed ventilation system is operating during construction, projects meet the below:
- Media filters with a minimum efficiency reporting value (MERV) of 8 are used to filter return air.
- All filters are replaced prior to occupancy.
The below moisture and dust management procedures are followed:
- Carpets, acoustical ceiling panels, fabric wall coverings, insulation, upholstery and furnishings and other absorptive materials are stored in a separate designated area protected from moisture damage.
- All active areas of work are isolated from other spaces by sealed doorways or windows or through the use of temporary barriers.
- Walk-off mats are used at entryways to reduce the transfer of dirt and pollutants.
- Saws and other tools use dust guards or collectors to capture generated dust.
To reduce particulate matter emissions from both on-road and non-road diesel fueled vehicles (excluding delivery vehicles) and construction equipment, the below are met:
- All non-road diesel engine vehicles comply with the U.S. EPA Tier 4 PM emissions standards or local equivalent when applicable. Engines may be retrofitted with verified technology (required to be U.S. EPA or California Air Resources Board approved) at the time the equipment is first placed on the job site.
- All on-road diesel engine vehicles meet the requirements set forth in the U.S. EPA model year 2007 on-road standards for PM or local equivalent when applicable. Engines may be retrofitted with verified technology (required to be U.S. EPA or California Air Resources Board approved) at the time the equipment is first placed on the job site.
- All equipment, vehicles and loading/unloading zones are located at least 7.5 m [25 ft] away from air intakes and operable openings of adjacent buildings when possible.
Upon completion of construction (including installation of woodwork, doors, acoustic tiles, paints, carpets, movable furnishings and other interior finishes), 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 below volumes:
- A total air volume of 4,300 m³ of outdoor air per m² of floor area [14,000 ft³ per ft² of floor area] prior to occupancy.
- A total air volume of 1,100 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.
© International WELL Building Institute