Leegi levikukiirus ehk leegi levikuindeks on üksühikuga suurus, mille väärtust väljendatakse väärtusarvu kujul, kus asbesttsementplaadi levikuindeks on null ja punase tamme puhul sada.
The flame spread rate or flame spread index is expressed as an arbitrary numerical value, where the asbestos-cement board has a spead index of zero, and red oak has a value of one hundred.
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