I need to remove about a 12ft section of baseboard heater. The furnace is in the basement, the section I want to demo is on the floor above, there is no 2nd floor. The pipes are not copper, they are black iron with cast iron fittings. I need to drain and properly refill and purge the air. In the picture you can see I drew a rough example of how the section runs. The part I circled green is the section I need to remove. I can't remove this entire run of pipe because it has sections I need to remain. Just what's in the green needs to go. So I need to drain, demo the section out, refill and purge the air. Any help is appreciated. I can also take pictures or video of anything to help.