Measure Guideline: Selecting Ventilation Systems for Existing Homes

R. Aldrich

Research output: NRELSubcontract Report


This document addresses adding -or improving - mechanical ventilation systems to existing homes. The purpose of ventilation is to remove contaminants from homes, and this report discusses where, when, and how much ventilation is appropriate in a home, including some discussion of relevant codes and standards. Advantages, disadvantages, and approximate costs of various system types are presentedalong with general guidelines for implementing the systems in homes. CARB intends for this document to be useful to decision makers and contractors implementing ventilation systems in homes. Choosing the 'best' system is not always straightforward; selecting a system involves balancing performance, efficiency, cost, required maintenance, and several other factors. It is the intent of thisdocument to assist contractors in making more informed decisions when selecting systems. Ventilation is an integral part of a high-performance home. With more air-sealed envelopes, a mechanical means of removing contaminants is critical for indoor environmental quality and building durability.
Original languageAmerican English
PublisherNational Renewable Energy Laboratory (NREL)
Number of pages57
StatePublished - 2014

Bibliographical note

Work performed by Consortium for Advanced Residential Buildings (CARB), Norwalk, Connecticut

NREL Publication Number

  • NREL/SR-5500-61149

Other Report Number

  • DOE/GO-102014-4367


  • ASHRAE 62.2
  • balanced
  • Building America
  • central fan integrated supply
  • contaminants
  • dilution
  • energy recovery ventilator
  • exhaust
  • existing homes
  • fans
  • heat recovery ventilator
  • local
  • outdoor air
  • residential
  • residential buildings
  • ventilation
  • ventilation rate
  • whole-house


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