As a veteran HVAC service tech

Replacing worn or clogged boiler orifices restores the gas manifold pressure to manufacturer specifications

Vent limiters are designed for indoor use

Converting to LP requires a specific LP conversion kit with different orifice sizing and regulator springs

ensuring field compatibility and maintaining the original safety circuit integrity of the HVAC furnace inducer and heat exchanger assembly

Maxitrol R8110-412 Spring As a veteran HVAC serviceEnsure reliable gas pressure regulation with the Maxitrol R8110 412, a precision engineered violet range spring designed for field proven performance. This replacement regulator spring is specifically calibrated to provide a consistent outlet pressure range of 4 to 12 inches Water Column (W. C.), making it a critical component for fine tuning gas flow in commercial and industrial environments. Built to integrate seamlessly with the Maxitrol RV81, 210D