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There is a vent on top of my header (see photo). Should I remove this and plug it? I am trying to figure out how much main venting I need, and how to install them. My boiler is 150,000 btu gross hooked up to 7 radiators equalling 416 sq ft of EDR. Will probably order that publication on here describing all the vents, just gotta find my $5 coupon I got with "Greening Steam".