Ny fitaovana amin’ny vavahadin’ny afo Grade B dia ahitana hazo, vy, hazo vy, sns. Ny varavarana tsy misy afo Class B dia mitaky ny fahamendrehan’ny afo amin’ny vatan’ny varavarana dia tsy maintsy mihoatra ny 1h. 1.2mm ny hateviny electrolytic takelaka na galvanized taratasy no ampiasaina ho an`ny varavarana tohan-trano, ary 0.8mm matevina electrolytic lovia na tafo lamba no ampiasaina ho an`ny varavarana ravina.

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