Thread: DWV or Stormwater

Originally Posted by Flindersia

Apologies as I’m sure this has been answered a thousand times

Yep is has.

which PVC fittings I should be running on my extraction rebuild. I intend to use 150 PVC Stormwater pipe but should the fittings be DWV or Stormwater? I found in an earlier thread reference to strongly preferring DWV 90 deg elbows over Stormwater but what about other fittings such as 45 junctions (Y) fittings, elbows other than 90 degrees etc? Is there any difference between Stormwater and DWV on these or is it simply a cost decision?

DWV is designed to be stronger than Storm water but DWV MAY be more expensive but not much strength is needed to carry air with a bit of dust in it under teh relatively low pressures generated by DCs. Some inspection fittings are only available as DWV

DVW and Stormwater are interchangeable so some stores only carry the DWV fitting for certain sizes/shape. You are permitted to put DWV onto storm water systems but not VV and it saves them carrying the same thing for both systems.

The only fitting I would be specific about is the DWV "long radius 90º bend as they are much more efficient even given the the extra $ compared to the short stubby 90º bends for stormwater and 2 x 45º bends in either . There are no long radius bends available for Stormwater as far as I know. Details in this thread.

Look here
Ducting update.
and here
Air flow calibration measurements

In fact then ends of both the threads has a heap of info on bends and flexies etc