Furnace Inspection

This a Ruud Silhouette II. It looks to be well maintained. I turned the furnace off, then turned it on and turned the thermostat up and listened for it to fire. The fan came on and the burners lit in about 50-60 seconds. Everything seems to be functioning properly. Condensation line looks to be hooked up. There is a external gascock to shut off furnace if needed. I would say it is in good working condition