multiple vents?

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Hi i was just wondering if i were to use say three 3" vents do i work out the theoretical length as i would for one vent or would i need to work out the sd of the combined vents, and work from there?

also i read somewhere that if you do use more than one vent you should divide the vb by the number of vents? anyone help me with this?

Regards Kimado(",)
 
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