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I have an old Vent-Rite #11 on a single-pipe steam radiator. I noticed after the boiler shuts off the vent makes a suction hissing noise for about 10 minutes after the boiler has shut off. I can tell it's a vacuum. Is this considered normal operation, or is this a bad vent?
Also, is the #11 considered a "fast" vent? This radiator is at the farthest point from the boiler so I need to vent the air quickly.