socoj2 Posted April 15, 2019 Report Share Posted April 15, 2019 I am going to vent outside but i need a hard 90 degree elbow and there doesnt seem to be any 5" elbows The measurement on my outlet is 4.75" you guys know of anything that will give me ridge 90 degree eblow that will work with a 4.75" outlet? Quote Link to comment Share on other sites More sharing options...
Chestnut Posted April 15, 2019 Report Share Posted April 15, 2019 Could you transition to a 6" and then do a sweep 90? Either that or 5" schedule 80 pvc pipe is 4.76" ID. Quote Link to comment Share on other sites More sharing options...
drzaius Posted April 15, 2019 Report Share Posted April 15, 2019 Figure out a different way to do it. What you wanting to do there is basically reducing down to a 4" tight 90* elbow & that's going to kill airflow. Something that might work is to make a duct out of plywood & then put turning vanes inside to tame the turbulence. They can be had from an HVAC duct supplier. You would want to make it oversize as well & then fabricate a reducer to fit the outlet. Any chance you can post a picture? Quote Link to comment Share on other sites More sharing options...
RichardA Posted April 15, 2019 Report Share Posted April 15, 2019 Better air flow if you can use two 45* elbows rather than a 90* Quote Link to comment Share on other sites More sharing options...
gee-dub Posted April 16, 2019 Report Share Posted April 16, 2019 What drzaius and RichardA said; find another way, you will hurt your airflow too much with your plan. Many times people do not think about back-pressure in DC systems. If your filter bag is blowing up like a balloon, get more filter media. Exhausting outside is Nirvana, don't exit the freeway into a wall. Quote Link to comment Share on other sites More sharing options...
Fly2low Posted May 20, 2019 Report Share Posted May 20, 2019 5 inch PVC exists, but is darn hard to find, and ridiculously expensive compared to even 6 inch. As has been said, find another way Quote Link to comment Share on other sites More sharing options...
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