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Could be one of the many chemicals involved in its installation. Spray adhesive, PVC primer or glue, duct sealant. If this is a new system retrofitted in place of an older one, the smell is likely duct mastic applied to the inside of the plenums to seal them. The smell will fade in time. It's not hazardous at all. If it's a totally new house, with all new equipment and flex duct, the new flex duct will have a plastic-ey smell for a while, after all, its made out of plastic.

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Q: What would be the cause of a chemical smell in a new ac system?
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