ASHRAE 62.2 & Indoor Air Quality
What is ASHRAE 62.2?
The ASHRAE 62.2 Standard applies to all residential spaces that are “intended for human occupancy” in single family homes and multi-family structures up to three stories. These spaces include living rooms, bedrooms, kitchens, bathrooms, hallways, closets, store rooms, laundry rooms, garages, and basements.
What are the requirements to meet ASHRAE 62.2?

There are 2 components of the ASHRAE 62.2 standard that relate to ventilation fans: Whole Building Ventilation & Local Exhaust.

Whole Building Ventilation Requirement

1. Calculation:

  • Required Rate = Floor Area / 100 + (Number of Bedrooms + 1) x 7.5
  • If the number of occupants exceeds the assumed 2 persons for the first bedroom and 1 for
    each additional room, increase the ventilation rate as follows: Number of additional occupants x 7.5 CFM

2. Use the Whole Building Ventilation Requirements CFM chart from the ASHRAE 62.2 Standard:

Floor Area (sq. ft.) # Bedrooms & Required CFM
0-1 2-3 4-5 6-7 >7
<1500 30 45 60 75 90
1501-3000 45 60 75 90 105
3001-4500 60 75 90 105 120
4501-6000 75 90 105 120 135
6001-7500 90 105 120 135 150
>7500 105 120 135 150 165

Local Exhaust Requirement
A local mechanical exhaust system shall be installed in each kitchen and bathroom:

Area to be exhausted Exhaust Rates
Kitchens 100 CFM intermittent or 5 ACH continuous (based on kitchen volume)
Bathrooms 50 CFM intermittent or 20 CFM continuous

Each local exhaust fan counts towards meeting the ASHRAE 62.2 Whole Building Requirement.

How can S&P help meet ASHRAE 62.2?

The recommendations below are our top choices to meet the minimum requirements in the most cost effective way. We believe these options will cover the majority of applications. Please contact your local S&P Rep, Distributor or the Factory if you need a solution tailored to your specific application.

Local Exhaust Requirement   Whole Building Ventilation Requirement
1. The BEST Solution 3. A GOOD Solution



  • Inline Mixed Flow Fan with Continuous Ventilation Control (CVC)
  • The CVC allows a new or existing TD fan in the bathroom to run continuously at 20 CFM to meet the requirement.
  • A TD with CVC is the most efficient and cost effective way to meet ASHRAE 62.2.


  • Inline Mixed Flow Fan
  • Install a TD in the laundry room or other location away from the main living spaces (to minimize noise disruption) and set it to run continuously as the required CFM.
2. A TRADITIONAL Solution 4. The ULTIMATE Solution


Model PC - Premium CHOICE Series

  • Ceiling Mounted Bathroom Ventilation Fan

Model TR

  • Total Recovery for ALL Climates - The Ultimate ERV
  • We also offer HRVs for climates that experience extreme cold temperatures.


How does ASHRAE 62.2 relate to other Green Building Programs?
The ASHRAE 62.2 Standard is used as the basis ventilation and Indoor Air Quality standards of LEED for Homes, CALGreen (California Title 24, Part 11), ENERGY STAR® Homes Indoor Air Package, and other green building programs.
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