Re: Venting a Natural Gas Fired Boiler JacktheShack Only the installer of the heating equipment can answer the questions you pose, as to how the SS chimney can be effectively installed, and still comply with local fire code.
Washing Out a Steam Boiler (when skimming doesn't work) ... Main vents are an essential component of any steam system and can either make or break its efficiency. Yes ...
The radiator air vent, or air valve (also called a steam vent or steam valve), is used only in one-pipe steam boiler systems.It is usually located at the end of the radiator opposite the supply pipe, about halfway up or higher towards the top.
Venting the air from the main separately, and quickly, significantly improves the system's balance: with a large vent, the steam heads toward the end of the main before it starts filling the risers.
The ANSI Z21.13 standard contains a uniform test procedure used to evaluate the vent system of all certified boilers. Vent category specifies whether the vent system operates under a negative pressure or a positive pressure, and if it is possible for the products of combustion to condense into a liquid in the flue.