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A void in the marketplace clearly exists for self filling humidifiers which do not mount to the home furnace duct work. Here we list what products we have found that are available, and close approximations or substitutes.A void in the marketplace clearly exists for self filling humidifiers which do not mount to the home furnace duct work. Here we list what products we have found that are available, and close approximations or substitutes. These will work independently of the HVAC system.