A brand-new furnace will typically emit a noticeable chemical or metallic "stink" or burn-off odor during its first few operational cycles, lasting anywhere from a few hours to a couple of days of intermittent use. This odor is caused by factory-applied protective oils, cutting fluids, and residues baking off the fresh metal heat exchanger and combustion chambers as they reach high temperatures for the first time. To help clear this odor out of your home more quickly, you should open several windows and doors to cross-ventilate the living space while the furnace runs. If the chemical burning smell persists strongly after three to four days of regular heating use, you should contact the installing contractor to ensure no packaging materials were left inside the cabinet.
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