Performed commercial heating maintenance Sacramento. Went thru system is a 11 yr split Goodman furnace in winery next door have to partially remove paneling to access furnace. Tested system running ok. Gas pressure good. Cleaned burners and flame sensor. Filter 14-30-1 looks good. Unit is oversized for space but works well. It heats up fast. Checked electrical connections all tight no burn marks at this time. Silver flex ducts.