i need your valuable advice with my situation, i am planning to install an ERV, home is solid walls airtight, about 1500 sqf with 4 occupants.
question 1: flexible ducting or square sheet metal solid duct?
question 2: manifold with 8 inch intake split to 6 ports of 4″ for the fresh air and 8 inch manifold split into another 6 ports of 4″ for the exhaust. is it better or if i run an 8 inch round metal duct with 6 inches connections to each room. where i live they don’t install ERVs otherwise i would have called a contractor, but i’m doing the homework myself.
so a manifold is better than main tube with inlets/outlets to each room? and how much does it affect the capacity of the ERV as per calculations i only need about 100 CFM
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