220g reef ready over flow rates

Just curious on if they stock 1.5" durso overflows can handle about 900-1000 gph ea? Got to thinking about the flow rates on the new tank. I will be using a mag 24 after head I'm guessing around 1800 gph out of it. Tank has stock overflows that are 1.5" Durso overflows that stay 1.5" down to bulk head and goes to 1", after it comes out under the tank I will be going right back to 1.5" PVC to the sump straight shot. Will these be able to handle the flow rates? I will have the mag 24 come out 1.5" to my UV where it will jump up to 2" slip unions and the after the UV back down to 1.5" to a Tee fitting. Once i hit the Tee fitting it will split to 2- 1" return lines to each return bulkhead.
Anyone see an issue with this setup.