| http://www.w3.org/ns/prov#value | - This draft or upward draw facilitates burning conditions in a fireplace and prevents smoke or unburned gas from entering aroom, while also preventing leaves, dirt, animals, wind and other foreign objects from entering the flue.In a preferred embodiment of the present invention, the fan is a positive displacement fan located at the inlet of the cross member for generating an air flow stream through
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