Combustion Safety for Appliances Using Indoor Air

Stacey Rothgeb, L. Brand

Research output: NRELFact Sheet


This measure guideline covers how to assess and carry out the combustion safety procedures for appliances and heating equipment that uses indoor air for combustion in low-rise residential buildings. Only appliances installed in the living space, or in an area freely communicating with the living space, vented alone or in tandem with another appliance are considered here. A separate measure guideline addresses combustion appliances located either within the living space in enclosed closets or side rooms or outside the living space in an adjacent area like an attic or garage that use outdoor air for combustion. This document is for inspectors, auditors, and technicians working in homes where energy upgrades are being conducted whether or not air infiltration control is included in the package of measures being applied. In the indoor combustion air case, guidelines summarized here are based on language provided in several of the codes to establish minimum requirements for the space using simplified prescriptive measures. In addition, building performance testing procedures are provided by testing agencies. The codes in combination with the test procedures offer comprehensive combustion safety coverage to address safety concerns, allowing inexperienced residential energy retrofit inspectors to effectively address combustion safety issues and allow energy retrofits to proceed.
Original languageAmerican English
Number of pages2
StatePublished - 2014

NREL Publication Number

  • NREL/FS-5500-61328

Other Report Number

  • DOE/GO-102014-4381


  • Building America
  • combustion safety
  • gas appliances
  • gas furnaces
  • gas venting
  • gas water heater
  • indoor air for combustion
  • national fuel gas code
  • Parr
  • residential
  • residential buildings
  • unconfined spaces


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