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Considerations
Older gas units often burn inefficiently and produce substantial amounts of potentially harmful gases, including carbon monoxide. As a safety precaution, many manufacturers and codes require that any damper in the venting systems be permanently fixed in an open position. The Schultz Property Inspection Technical Staff notes that while the new ventless units burn efficiently and technically do not require vents, they can still contribute to indoor air pollution concerns. In addition, since water is a by-product of combustion, regular use can add significant amounts of potentially damaging moisture inside the house. Consequently, periodic inspection for any detrimental conditions is important.
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