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Modifying Gorton Radiator Vent Rates
Has anyone ever modified a Gorton radiator vent orifice to change the venting rate? I'm wondering if the vent rate is dictated by the visible orifice on the outside or if there is an internal one as well. I suspect it's the outside hole since that would make manufacturing easier.
Basically, I'm looking to make a Gorton "4.5" or a "5.5". I'm considering drilling out the hole slightly larger to get venting rates in between the standard sizes.
Burnham IN5PVNI Boiler, Single Pipe with 290 EDR
18 Ounce per Square Inch Gauge
Time Delay Relay in Series with Thermostat
Operating Pressure 0.3-0.5 Ounce per Square Inch