http://www.misiuneacasa.ro/forum/showthread.php/5420-Caderea-corecta
-teava PVC50 panta normala este de 3.5%
-teava PVC75 = 2,5%
-teava PVC100 = 2%
-teava PVC125 = 1,5%
-teava PVC150 = 1%
-teava PVC200 = 0,8%
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