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13D backflow preventers

R

retire09

Silver Member
Joined
Feb 19, 2010
Messages
365
Location
Alaska
Does a 13D stand alone wet system with no anti freeze require the installation of a back flow preventer?

I am told that they do, but the only requirement I can find in 13D involves antifreeze.

Can anyone give me a reference section in 13D?
 
My 2007 13D does not require backflow protection - however the Annex (explanatory info) advises that backflow and metering is subject to local regulation, and a diagram indicates a "rubber faced check valve" as being optional.
 
none required. some ahj will require the system to have a loop that would hook up to a water closet to keep the water from stagnation.
 
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