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Test a piece of the blue foam for burning. I think it goes up pretty fast. You usually need fire rated drywall over it to make a fire rated wall. Also, I know the blue stuff gives off some bad smelling VOC's when it gets warm.
Since your in the HVAC biz as I am, How about armaflex. You can buy sheets of it from United. It has a low smoke test for plenum ceiling ratings, very flexible, closed cell, high R rating per inch and you can buy it wholesale.
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