i will shortly be installing finned 3/4"copper finned baseboard heating in a remodelled basement. because the heating loop has to cross a hallway to get from one side of the basement to the other, the loop will go up and down from ceiling to floor two times as it travels from the supply side of the boiler to the return side of the boiler. are there any piping precautions/fittings i should incorporate in this loop (zone) to address potential air bound conditions? basement zone has its own circulator which is mounted on the return side just before the boiler. the supply manifold has an air purge device mounted just before the 4 take offs for the 4 heating zones. comments appreciated.