replace Beta Update section with:
"The credit has been restructured to a list of 10 strategies. New strategies are included for (1) filtration of recirculated air, (2) increased ventilation at 15% above prerequisite levels, and (3) operable windows.
Referenced standards for Strategy 4. Filtration of recirculated air and Strategy 9. Carbon dioxide monitoring have been updated to recent versions as follows: :
 ASHRAE 52.2-2010  ASHRAE 52.2-2017
 EN 779-2002  ISO 16890-2016 ASHRAE 62.1-2010  ASHRAE 62.1-2016
The strategies for natural ventilation and mixed mode ventilation have been updated to align with EQ prerequisite Minimum indoor air quality performance to encouraging natural ventilation design beyond prescriptive values as defined in ASHRAE 62.1-2016 addendum L as naturally ventilated engineered systems.
The strategy for Exterior Contamination Prevention has been removed from this credit but may be pursued as an innovation credit.
"

Under Step-by-Step Guidance, replace with following text:

"Step 1. Select strategies

Determine which strategies the project will pursue.

Step 2. If pursuing Strategy 1 Entryway Systems

Refer to LEED v4 reference guide, Option 1. Enhanced IAQ Strategies, Entryway systems

Step 3. If pursuing Strategy 2. Interior Cross-Contamination Prevention
Refer to LEED v4 reference guide, Option 1. Interior Cross-Contamination Prevention and use ASHRAE 62.1-2016, Table 5.5.1 that lists minimum separation distances for air intakes.

Step 4. If Pursuing Strategy 3. Filtration of Outdoor Air

Follow LEED v4 guidance for specifying outdoor air filtration media meeting credit requirements for minimum efficiency reporting value (MERV) ratings per ASHRAE standard or equivalent filtration media class of ePM1 50% or higher per ISO 16890- 2016, Particulate Air Filters for General Ventilation, Determination of the Filtration Performance instead of EN 779-2002- Class F7 filters or higher.
Step 5. If Pursuing Strategy 4. Filtration of Recirculated Air
Identify all HVAC equipment that supplies recirculated air to occupied spaces and specify filtration media that meet the credit requirements for minimum efficiency reporting value (MERV) ratings or equivalent filtration media class.
Step 6. If Pursuing Strategy 5. Increased Ventilation 15 Percent
Follow the EQ Prerequisite Minimum Indoor Air Quality Performance prerequisite’s steps for mechanical ventilation systems to determine the amount of outdoor air that must be supplied by each ventilation system. To meet the credit requirements, the system must deliver 15% more outdoor air to 95 percent of the occupied spaces at all times the space is occupied. For multiple-zone recirculating systems, this will likely increase the required outdoor air intake for the system by more than 15%.
Step 7. If Pursuing Strategy 6. Increased Ventilation 30 Percent
Follow the EQ Prerequisite Minimum Indoor Air Quality Performance prerequisite’s steps for mechanical ventilation systems to determine the amount of outdoor air that must be supplied by each ventilation system. To meet the credit requirements, the system must deliver 30% more outdoor air to 95 percent of the occupied spaces at all times the space is occupied. For multiple-zone recirculating systems, this will likely increase the required outdoor air intake for the system by more than 30%.
Step 8. If Pursuing Strategy 7. Operable Windows
Identify all regularly occupied spaces and collect the following information for each space:
 Location of openings (on one side, two opposite sides, or two adjacent sides),
 Size of the opening (openable area).
Review section 6.4.1.2 in ASHRAE 62.1-2015 addendum l for window size and location requirements and compare the results with the design. Revise if necessary, to ensure that all regularly occupied spaces meet the requirements.
Step 9. If pursuing Strategy 8. Engineered Natural Ventilation
This strategy is met if the project complies with natural ventilation Option 2 under the EQ Prerequisite Minimum Indoor Air Quality Performance.
Step 10. If Pursuing Carbon Dioxide Monitoring

Refer to LEED v4 reference guide, Option 2. Additional Enhanced IAQ Strategies, Carbon Dioxide CO2) monitoring section . UseASHRAE 62.1-2016, Appendix C for determining CO2 concentration set-points.
Densely occupied spaces are defined as: an area with design occupant density of 25 people or more per 1,000 square feet (93 square meters).
Step 11. If Pursuing Additional Source Control and Monitoring
Refer to LEED v4 reference guide, Option 2. Additional Enhanced IAQ Strategies, Additional Source Control and Monitoring"

Under Further Explanation add new section for Required Documentation and Exemplary Performance:

Required Documentation

 Strategy 4. Mechanical schedules highlighting MERV or filtration media class for all units that supply return air
 Strategy 6. Increased ventilation: confirmation (calculations are documented under EQ Prerequisite Minimum Indoor Air Quality Performance)
 Strategy 7. Diagrams or description of location of operable windows and opening size calculations
 Strategy 8. Natural ventilation confirmation (calculations are documented under EQ Prerequisite Minimum Indoor Air Quality Performance)

Exemplary Performance
Comply with 8 strategies