Rauni Finned Tube
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L, LL, KL Finned Tube (Rauni Finned tubes)
Ana amfani da bututun Finned na ƙafa a cikin na'urar musayar zafi, wanda bai wuce kusan digiri 400 ba, kuma ana amfani dashi da farko a aikace-aikacen sanyaya iska (ciki har da manyan radiators da manyan na'urorin sanyaya mai).
