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Gonna need at least a 3/4" line. Is that 50 foot from the gas meter? Are there other gas appliances that will be using this line. Or is this tapping off an already existing gas line. Flue pipe size will probably what ever ize the furnace is. You can probably download the install manual from Reznor if you don't have it.
 

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Discussion Starter · #4 ·
Gonna need at least a 3/4" line. Is that 50 foot from the gas meter? Are there other gas appliances that will be using this line. Or is this tapping off an already existing gas line. Flue pipe size will probably what ever ize the furnace is. You can probably download the install manual from Reznor if you don't have it.
********************************No its from the gas line from the other furnace that is 90,000btu
 

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Then you may need to resize the entire gas line since the line running to the furnace probably wasn't sized to handle an extra 75 CFH.
 
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