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Mike Chalmers,
Just saw this thread. I have an SDD and I used a 5" to 6" adapter on mine and 6" flex hose from there. I only use it on one machine at a time. I'm powering mine with a small 1 HP Penn State blower, and it works fine with only the 6" flex hose. With a 2HP unit powering your SDD, you should be able to use 6" pipe in a well designed layout without issues. Adapting your machines to the larger 6" ports will be a challenge, but you will be glad you did. I would never go back to 4" ducting.