Im sure I am probably overthinking this for a 6'-7' run. I have the blower in the attic bolted in a fixed position. I'm trying to do my run with straight pipe with as few elbows as possible. The trusses make it difficult to get from point A to B so I think I would either need to do 3 90 degree elbows (1 coming up from the garage, 1 making a turn, and 1 into the intake of the blower) with the straight 6" pipe or I could make it a lot easier with a the semi-rigid pipe would make a more continuous run but not hard pipe. Thanks!