{"id":"intumescent","license":"CC-BY-4.0","data":{"term":"intumescent","shortDef":"A material that swells when heated and can close a gap. Some listed vents use intumescent cores. A paint-on coating is not an Oregon R327 wall covering.","doNotSay":["fireproof paint"],"relatedGlossary":["listed","ignition-resistant"],"relatedCategories":["vents"],"relatedStandards":["astm-e2886"],"relatedGuides":["mesh-vs-listed-vents"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}