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Cindie; Some new furnaces of to-day do use combustion air that is piped in from outside. This VENT that was placed on the side of the furnace must of been put there for some unknown reason.You say its on the Side of the Furnace? and blows hot air? What size? It would be interesting in finding out the reason why it is there.... This is usually a NO-NO. NEITHER a supply opening OR a Return opening should be in very close proximity of any GAS furnace. Why don't you call the installer and get a reason for this. After many years of installing,etc i would also be curious about this . Let us know how you make out. Hube
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