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Vent Lengths for 4 Inch Diameter (12.57 Square Inches Area) Vents

 

Vent Lengths for (2) 4 Inch Diameter (25.14 Square Inches Area) Vents

Go to Vent Length Charts (SIngle and Dual Port)
2 inch Vents    3 inch Vents    5 inch Vents     6 inch Vents

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