Typically no, but most will fit inside a 6" coupling if you cut some threads for the wire spiral.
Threads.jpg
Typically no, but most will fit inside a 6" coupling if you cut some threads for the wire spiral.
Threads.jpg
Beranek's Law:
It has been remarked that if one selects his own components, builds his own enclosure, and is convinced he has made a wise choice of design, then his own loudspeaker sounds better to him than does anyone else's loudspeaker. In this case, the frequency response of the loudspeaker seems to play only a minor part in forming a person's opinion.
L.L. Beranek, Acoustics (McGraw-Hill, New York, 1954), p.208.
You may find 5" PVC conduit at a local electrical supplier cheaper than 5" pvc pipe.
I have been struggling over having a larger main line than the branches. I have been thinking about exactly what you have with a 7" main line and 6" branches. If I only use 1 tool at a time and only have one gate open at a time is there any advantage to have the 7" main line? A 7" main line or bigger makes sense to me if I had more than one gate open at a time but being a one man shop it seems like a 6" main line would be sufficient??? I certainly wouldn't want to go down to a smaller duct diameter. Most of my machines only have 4" dust ports except my new to me table saw has a 6" port.
I have a used 3hp 3ph blower on a fair sized cyclone out of a professional wood working shop that closed. They had the most cobbled together ducting I have ever seen with 3 or 4 different types of pipe including metal, HVAC duct and different sizes and different wall thicknesses of PVC.
Last edited by Michael Schuch; 11-29-2021 at 3:45 AM.
Michael, if you have longer horizontal runs going up to a 7" main definitely has benefits, mainly less friction losses, therefore more airflow. 800 cfm airflow on a single machine is not out of the question. I pull that much or more with my 2 hp Oneida SDG (same as Jim) with my TS, 5" bottom, 3" top connection. 6" pipe size on your vertical runs would be recommended to increase velocity a bit to be able to pull small offcuts along with the dust and chips. 800 cfm in a 7" duct will get you almost 3000 fpm velocity, the same flow in a 6" pipe will get you a bit over 4000 fpm velocity but at the cost of more friction losses..
NOW you tell me...