In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
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".