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Converting from propane to natural gas
I am converting a propane heater from propane to natural gas. The unit is 100,000 btu. The propane was 11 inch water column. The natural gas is max 7 inches water column . Changed gas valve no problem. I need to drill out the nozzle. Polished off one of the nozzle and found a number 55 on it. How do I know how big of a hole to drill nozzle out. Can some direct me to a chart that would show some options. I had a hard copy of one years ago, but its long gong. It’s not to often that I convert from propane gas to natural.