A new study found vent-free gas appliance used in "tight" homes do not result in NO2 concentrations that exceed guidelines for indoor air quality.
The new study was commissioned by the Vent-Free Gas Products Alliance Product Section of the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). It included 100,000 simulations used to evaluate nitrogen dioxide (NO2) emissions from vent-free gas fireplaces, logs, inserts, space heaters, and stoves in "tight" homes.
"Tight" homes are those designed to be as air-tight as possible, usually with mechanically controlled ventilation--a method used today in the design of many new homes.
"There has been some concern recently about NO2 levels in homes that are sealed more efficiently than they have been in the past," said Sue Walker, chair of the Vent-Free Gas Products Alliance Product Section and senior director of Government Affairs at Empire Comfort Systems. "As manufacturers of this energy-efficient home heating option, it was incumbent upon us to investigate this matter and ensure the safety of these products."
Third-party toxicology firm toXcel conducted the study. The study compares predicted NO2 levels from vent-free appliances against NO2 limits specified by the U.S. Consumer Product Safety Commission, Health Canada, and the World Health Organization. The study summary is available for download from the AHRI website: CLICK HERE.
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