Great video. You're a smarty!

Very good. A lot of installers don't know anything about drain lines or drain traps.

Thanks for the video. Here I sit, it’s 13 degrees outside and our furnace has stopped working. Every year for a few days of cold weather, our condensation line freezes somewhere, and each year our HVac person comes out after the fact and adds a heat tape our something else to line. I’ll have a better understanding this time around.

Thanks for this video. I need to add a trap to my unit which is located in a closet. I don't have much room to design a trap system without blocking the air filter access. I could install it in the supply area below the unit but then my vent after the trap (cap with hole) would be installed in a negative pressure area. I assume that is not good. I can install it in front of the unit but then it would block the air filter. Using pvc unions might be an option. This would allow me to remove the trap for cleaning when replacing the air filter.

I have to be the bad guy here but why is the trap not over the safety pan

Good video, my line currently is leaking into my crawlspace, i’d like to make a new one for it and I was wondering can I have it drain right to my sump pump basin which is only a couple feet away