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General Requirements A. Furnish and install ( ) low pressure packaged, sealed combustion, power vented, high Efficiency gas fired cast iron sectional boiler(s) that that can use outside air for combustion. B. Install boiler-burner unit(s) in compliance with manufacturers installation instructions. All work must be done in a neat and workman like manner. C. Weil-McLain qty.( ) CGs boiler(s) size(s) ( ) capable of burning natural gas at 5 to 13”w.c. or propane 11 to 13”w.c. inlet pressure. 1.