I have a 40Kbtu condensing furnace, currently no AC. The furnace uses 1/2 materials inside for condensate. I'll be using 3/4" or 1" material to route the drain out into a lightwell (inspector is comfortable with that.)_
Can I uses standard elbows, or do I have to use sanitary sweep type fittings?
Standard elbows are fine but the drain MUST be in PVC or vinyl tubing or whatever the inspector prefers. No copper or steel or galvanized pipe as the condensate is acidic and will eat them. I use schedule 40 white pvc
"Cut it twice and it is still too short".