While looking up cfm for turbine vents, now I'm thinking I need more volume in system. What are thoughts on inlet piping, having 4" entering into cellar and at exit however having 12" piping for run to increase volume. I'm thinking possibly two 12" "storage" sections of piping with 4" inlet and outlet. pipe run from outside to cellar, 4" pipe for first 4' then splits to two 12" pipes then back to a single 4" pipe into cellar. Not sure if the splitting and pipe reductions would greatly affect the air flow, same size on either side.
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