Supporting double wall pipe from ceiling

[mike93lx]

The exhaust pipe supports for my water heater and furnace are janky and I want to get it cleaned up. The smaller pipe is 4.5" OD, bigger looks like 5.5" OD.

What spacing should the supports be? It's been like this for 20 years, so it's working.

My thought was a few swivel rings, threaded rod and Sammys into the joists

The wire is going into some wiremold as part of this and I want to also clean up the tape "firestop" at the ceiling

https://www.supplyhouse.com/Bluefin-GVSV500-5-Em-Lok-Adjustable-Swivel-Ring-NFPA

https://www.supplyhouse.com/Cooper-B-Line-ARW-37-200-3-8-Rapid-Rod-Wood-Hanger-1-4-x-2

Any suggestions?

 

[Jim greengo]

I'd normally just cut down an S or a Drive to whatever length I need and screw it on there.
I normally use those hangers for hanging cast iron .

 

[Jim greengo]

A picture of your project would help.

 

[gmcgeo]

I have always used drives as well, they do make round clamps for b-vent i believe.

I was thinking like this b-vent support

 

[kaymccampbell]

That seems like overkill. I hang horizontal stovepipe every 2-3' with some nice perforated strap and a GRK cabinet screw.