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Our Scans · (43220) Plumbing, Heat & Air-Conditioning Installation · Weekly Summary


  • Classified as A2L, or mildly flammable, by the American Society of Heating, Refrigerating and Air Conditioning Engineers, R454 - B will require updates to standards and building codes to allow for their safe installation. TDIndustries

Last updated: 19 June 2026



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