Can a common brass air vent be used to release air in a plumbing application, or a domestic/heating hybrid system? No! All devices installed in plumbing systems, since January 14, 2014, need to meet the requirements of the Safe Drinking Water Act. This means low lead brass, and NSF 372 (or NSF 61, depending on the Authority having Jurisdiction). The Caleffi NA5026 Series PLUMBVENT is the answer; it is designed for plumbing applications and has a hygroscopic vent cap which prevents potential dripping.
The PLUMBVENT is perfect for releasing air from domestic hot water storage tanks or water heaters, any high point in the piping system, and near the suction side of a domestic hot water recirculation pump to prevent air lock.
Check it out, at this web page: https://www.caleffi.com/usa/en-us/catalogue/plumbventtm-na502640a
Can I get a 10 inch NA546 DISCALDIRT Air and Dirt Separator that is NSF 61 Certified?
In reply to Can I get a 10 inch NA546 by Steve Tedesco
Steve, Our NA546 DISCALDIRT is for use with a hydronic or chilled water application and is designed to be a multipass device. This is not low lead or NSF61 or 372 certified. We do not have a air or dirt separator rated fo domestic water use. The ony product rated for domestic water is our PlumbVent Model NA502640A which is an air vent with 1/2" MNPT connection.
In reply to Steve, Our NA546 DISCALDIRT by dan_firkus
I have a system that is a combined domestic hot water/hydronic (aquatherm fan coil) piping system. The building HW circulates through a combined set of boilers/water tanks and a 3-way valve splits the DHW in the building with the Hydronic hot water.
Will this 1/2" NA502640A be adequate to install before the hydronic HWS pumps? My goal is to protect the hydronic loop fan coil units and pumps. Would you recommend each fan coil HW branch get one of these as well or should I consider just one at the top of each riser?
This is a unique project with unique concerns. Just trying to protect equipment.
Craig, The NA502640A is going to be the only low lead air vent available for domestic water applications. If using domestic hot water through the fan coil unit you will need to make sure the diverting valve and all components are rated to be used with domestic water. If not you will want to separate the units to a hydronic closed loop circuit independent of the domestic hot water for the building.