Reply by 8iowa

2 1/2” to 4” adaptors are inexpensive and readily available. The trouble with a 4” hose is that on a smaller HP dust collector, the velocity may fall below 3500 fpm, letting dust accumulate in the hoses. The airstream velocity falls according to the square of the difference in diameter. Sorry for getting too technical here….........just keep in mind the fact that the air speed will decrease in a larger pipe or hose much faster than one would think.

Also in a very small shop, a 4” hose is clumsy & easy to trip over, and where can you put the thing to keep it out of the way when not in use.

Below is my dust collector, “tucked” neatly in the corner by the garage door. I actually have two eight foot hoses, which can be connected together if necessary. They stow nicely behing the dust collector. My shop here in Gainesville is in one half of the two car garage. My wife has her quilting machine in the other half. Obviously I need to keep the environment dust free. Thankfully, my dust collector has been keeping my wife happy.

-- "Heaven is North of the Bridge"