Ny varavaran’ny afo izay resahinay matetika dia varavarana afo insulation mafana (izany hoe varavaran’ny afo Class A), izay afaka mahafeno ny fepetra takian’ny fahamendrehan’ny afo sy ny insulation mafana amin’ny fotoana iray ao anatin’ny fotoana voafaritra. Varavaran’ny afo miaraka amin’ny tahan’ny fanoherana afo tsy latsaky ny 1.5h.

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