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Recommendations for main venting
Hey Everyone, long time lurker - first time post.
I need help with proper sizing and recommendations for my main vent.
The boiler is about 15 years old. This is my second year owning the house with this system. So far I have gone thru it and tightened / repaired that packing nuts that needed it and replaced all radiators with ventrite #1s. My last few radiators on the line take forever to heat up but eventually if the system runs long enough they will. I believe my problem lies in the main venting.
1 pipe system with approx 80 feet of 2 inch pipe for the mains. Attached are a few pictures for reference.
What should I do for the main venting? And proper size?