If you run 2 wetdrys next to each other and tee it to make for one hose, would there be any increase in vacuum? This would be for dry vacuuming concrete and wood dust.
If the vacuums are identical with same size motors, you should probably be able to double your suction, if your running large enough hose so you don't create friction loss. 2 1/4 inch should be ok. If your running a large shop vac and smaller one, the larger one may back suck the smaller one. It's the same problem with portables and vac boosters.
