I installed a new furnace in our MH this winter and the first 20 or so times it smelled a bit weird. I think it is just the manufactuing oils and such burning off. The exterior plate is an intake for combustion air as well as the exaust for the furnace.
I would still get the C02 detector as a safety device, but the smell should fade with use.
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Brett G
WBCCI #5501 AIR # 49
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1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
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