IAQ1: Provide whole building and local exhaust ventilation based on ASHRAE 62.2-2016 Ventilation and Acceptable Indoor Air Quality in Residential Buildings:

• Include whole building ventilation sizing in Manual J calculations 
• Install labeled, accessible whole building ventilation controls 
• Verify whole building ventilation airflow cubic feet per minute (CFM) 
• Select a whole building ventilation design (choose one): 
  • Balanced system 
  • Supply system with ≥MERV 4 filter prior to outdoor air entering living space or HVAC unit 
    • If central fan integrated system is used, HVAC system must be equipped with variable speed motor and thermostat 
  • Stand-alone exhaust system designed to operate continuously. All HVAC systems must be equipped with ≥MERV 13 filter. 
• Vent all full bathrooms with ENERGY STAR ≥50 CFM on-demand exhaust fan to exterior 
  • Bath fans ducted using prescriptive design based on ASHRAE 62.2-2016 or measure airflow CFM at final
• Vent all kitchens with ≥100 CFM on-demand range hood to exterior 
  • Range fan ducted using prescriptive design based on ASHRAE 62.2-2016 or measure airflow CFM at final. If range hood capable of ≥400 CFM, install make-up air to meet IRC 2012 requirements

Purpose

Whole-house ventilation introduces fresh air into living spaces to dilute pollutants that cannot be removed completely through spot ventilation and/or filtration, thus providing for a healthy indoor environment.

Criteria

Install a whole-building mechanical ventilation system and mechanical exhaust systems that are designed to meet the air flow requirements of ASHRAE 62.2-2016.

The whole building air flow may be calculated based on Section 4.1.1 Total Ventilation

OR

Projects may use Table 4.1a to determine minimum cfm for whole building ventilation

Local exhaust system airflow cfm may be verified via a field measurement completed during the final inspection, or by designing and installing the distribution system based on the Prescriptive Duct Sizing Table:

Confirmation

The HVAC Manual J Load Calculation shall include whole building ventilation cfm based on the calculations in ASHRAE 62.2-2016. The Technical Advisor will review the Manual J report to verify system has been designed for ventilation airflow. At final, Technical Advisor shall field verify that installed ventilation airflow cfm meets the minimum continuous airflow required.

Note: 

• Projects may design whole building ventilation cfm using the infiltration credit in ASHRAE 62.2-2016. Technical Advisor shall review Manual J input for reasonableness, and at final shall field verify actual building envelope infiltration and ventilation airflow cfm. If necessary, whole building ventilation shall be field adjusted to comply with ASHRAE 62.2016. 
• Projects using the Prescriptive Duct Sizing Table for local exhaust shall document compliance with photo documentation capturing ≥75% of the distribution system