State by State Code Acceptances for Vent-Free Gas Appliances 
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Letter on New York Requirements for Vent-Free Gas Appliances
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New York Sizing Guide
How to Select an Appropriately-Sized Vent-Free Gas Heating Product
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BREAKING NEWS: IAPMO Adopts the use of Vent-Free gas appliances
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IAPMO Article in October 2005 issue of Official Magazine
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Water Vapor Technical Paper
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