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What does it do with the vent removed ?

Perhaps I can encourage them to add a strainer while they are re-piping it anyway. That is after all, depicted in the Burnham diagram.

These circulators are designed to work with a certain amount of pressure. Steam boiler have close to zero pressure as it is and you would like to eliminate anything that might reduce that pressure.

Not sure how well the "E" circulators work with your typical steam boiler, that has some degree of dirty water. Not a big fan of introducing anything that restricts flow or causes pressure drops. Including flowchecks and filters

Put the circulator as close to the boiler outlet as possible. And even more importantly, put the circulator as close to the floor as possible. Personally, I do not use flowchecks at all in these applications. I tell from the picture, and my apologies if this has been mentioned, but make sure the return tapping is low enough that it is constantly submerged in water. Even when the boiler water level drops due to normal operation..... 1" is a typical minimum pipe size that I try to use, and have used many times successfully.

Aye,,,, I've used them too — but for the pump vibration, not a boiler vibration.