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

Increased ventilation

The guidelines put forth by ASHRAE provide the basis for acceptable indoor air quality, but not necessarily for best-in-class air quality for buildings. Unusually high building occupancy, a high risk of accidents that might degrade air quality or space capacity to install filtration make exceeding ASHRAE requirements a worthwhile strategy.

Part 1: Increased Outdoor Air Supply

The following is required in terms of the rate of outdoor air supply to all regularly occupied spaces:

a.1 Exceed ASHRAE outdoor air supply rates met in the WELL Ventilation Effectiveness feature by 30%.

Applicability Matrix

Core & Shell New & Existing Buildings New & Existing Interiors
Part 1: Increased Outdoor Air Supply O O O
Commercial Kitchen Education Multifamily Residential Restaurant Retail
Part 1: Increased Outdoor Air Supply - - O - O

Verification Methods Matrix

Letters of Assurance Annotated Documents On-Site Checks
Part 1: Increased Outdoor Air Supply MEP

U.S. Green Building Council. LEED v4: Reference Guide for Building Design and Construction. Washington D.C.: U.S. Green Building Council; 2013: 37, 43-44, 541-552, 567, 605, 623, 645-53, 658-61, 682-3, 685-6, 723-4.


USGBC's LEED v4 EQ prerequisite: Minimum Indoor Air Quality Performance requires using the minimum outdoor air intake flow for mechanical ventilation systems using the ventilation rate procedure from ASHRAE 62.1–2010.