just purchased an oneida cyclone. understanding that the best cyclone can be hamstrung by poorly planned ductwork, i was curious to see what sort of ductwork plan they would recommend. just got their preliminary recommendations and i'm not sure i understand their plan.
rather then running 6 in (or larger) ductwork through the shop with 6 in drops (and 6-to-4 reducers where necessary), they are recommending 5 in drops (and 5-to-4 reducers). i thought that when setting up DC ductwork you want to (among other things) use the largest possible ductwork. assuming this is so, why would you want to use 5 in drops instead of 6 in drops? this is a 3 hp unit with a 15 in impeller, so it's not like it can't pull sufficient air through 6 in pipe.
i'm certainly NOT saying they're wrong. they know more about this stuff than i will ever know. i'm just not sure i understand the basis for their recommendation. i want as little SP in this system as possible and my understanding is that as the size of the pipe decreases the SP increases. i'd appreciate any insight that y'all can offer.
also, does anybody know of good places to get DC ductwork? before buying from oneida i want to make sure i can't get the stuff elsewhere for a better price. i have a feeling i can, but just don't know where to look.
many thanks.