Gas Firing Rate

Albert Huntermark

I recently saw a video on gas fired furnaces and boilers. In it they showed you how to calculate the firing rate for the burners. They had a neat slide rule type cardboard calculator in which you looked up the burner orifice size and it would tell you the corresponding btu rates, and gas pressures and so fourth. My question is where can I get one these of or something like this?

seawood

Like this

seawood

Like this
http://www.andersonforrester.thomasregister.com/olc/andersonforrester/orifcapa.htm

Me_8

Might try a carrier or bryant distributor and ask to see a GT26-01A they call it a natural gas furnace manifold pressure calculator. it is a cardboard slide rule thing not sure if its what you have in mind though