Q1c: Ventilate and exhaust for pollution control

Ventilation provides clean, fresh air to occupants and removes pollutants that come from interior materials and finishes, cooking, cleaning, and residents themselves. Proper ventilation maintains appropriate humidity levels to prevent areas of excessive moisture that can foster harmful microbial growth.

  • For single family projects, meet Minnesota code for ventilation standards and verify performance through testing (Minnesota code requires that a ventilation system replaces indoor air at a rate of at .35 ACH or 15 cfm per bedroom plus an additional 15 cfm, whichever is greater)
  • For multifamily projects, design ventilation systems to meet ASHRAE Standard 62.2 Ventilation for Acceptable Indoor Air Quality
  • Separate air intakes from pollution sources to minimize risk of capture of contaminated air
  • Test to be sure that air handlers can maintain adequate pressure
  • Use carbon dioxide detectors to assess air quality and air ventilation rates
  • Use ducted returns, or, if a central return is used, ensure a reliable return air path through the use of transfer grills or jump ducts
  • Do not use internal duct insulation
  • Install bathroom fans and range hood fans that exhaust directly outside
  • Vent all combustion appliances to the exterior
  • Ensure proper safety and pollution control if fireplaces or fuel-burning stoves are installed
  • Install continuous exhaust ventilation or a central exhaust fan ducted from bathrooms and kitchens; provide make-up air vents
  • Install humidity control system where necessary to keep humidity below .012 lb water vapor/lb of dry air

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