Unfortunately we don't have a source for this article called "It's All in the Venting" by John Schulz, but it's probably one of the best articles we've ever read on air venting from steam systems. It helped Dan Holohan understand a lot when he was writing The Lost Art of Steam Heating.
This document contains the manufacturer's instructions for the HB Smith Series M450L Mills Water-Tube Boiler for automatic firing with oil or gas (Steam, Vapor, or Water ...
This document contains the jacket assembly instructions for the HB Smith Series 45 Mills Boiler (circa 1979).
This document contains the combustion chamber assembly instructions for the HB Smith Series 45 Mills Water-Tube Boiler for automatic firing with oil or gas (Steam, Vapor,...