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Hello all, I need some help with choosing the correct main vent. Background: Victorian house 3000 sf (14 radiators total) but, I have 3 on the 3rd. floor closed / old American Standard boiler / 31 ft. long main 3" diameter. Right now there is only (1) Hoffman #75 10 psi. at the very end of the main. Boiler sits toward the front of the house, main going to back of house. Can I use a Vent-Rite #75 5 psi. or stick with the Hoffman #75 ?