shoma bayad cfm va ofte feshar ro bedin va azash ab'Ad begirin..ofte feshar dar kanal 0.1 hast..vaghti cfm va oft ro dadin behetoon ghotre kanalo mide,age yeki az azlAye duct ro bezanin dovomiyo mide...masalan mikhayn yeki 8" bashe,8" ro midin oon yeki bod ro mide..masalan bara 200 cfm ba ofte 0.1 size kanal mishe 8"X6
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