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Old 10-15-2011, 02:44 PM  
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Default furnace cold air return

I have a high energy efficiention furnace and I have no cold air returns yet! I do however have the filter installed will it hurt my furnace to run a couple weeks without the cold air return?? As long as its not blocked!

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Old 10-15-2011, 04:07 PM  
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No, on a high efficiency furnace you will have a separate air intake for combustion air so you should be fine.
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