AHSRAE 62.2 & Indoor Air Quality

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.

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

Whole Building Ventilation Requirements

  1. Calculation:
    • a) Required Rate = [ Floor Area ] / 100 + ( [ Number of Bedrooms ] + 1 ) x 7.5
    • b) If the number of occupants exceeds the assumed 2 person limit 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 Requirements

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 Requirements.

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 Representative, Distributor or the Factory if you need a solution tailored to your specific application.

Local Exhaust Requirement

1. The BEST Solution

Model TD-MIXVENT with FT622

  • Inline Mixed Flow Fan with FT622 control
  • The FT622 allows a new or existing TD fan in the bathroom to run continuously at 20 CFM to meet the requirement.
  • A TD with FT622 is the most efficient and cost effective way to meet ASHRAE 62.2.


Model PC - Premium CHOICE Series

  • Ceiling Mounted Bathroom Ventilation Fan

Whole Building Ventilation Requirement

3. A GOOD Solution


  • Inline Mixed Flow Fan
  • Install a TD in the laundry room or other locations away from the main living spaces (to minimize noise disruption) and set it to run continuously as the required CFM.

4. The ULTIMATE Solution

Model TR

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

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.