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Look to Wood-Furnaces.net when you need replacement wood furnace parts, which includes this Royall WAC 16-Inch x 16-Inch. Royall's water to air (WAC) heat exchangers need to be installed when needing forced air. The WAC is installed above your exsiting nonrenewable gas furnace and below your A coil for your condesing unit used with central air. Many different sizes are available.