Completed AC inspection for customer today. All aspects of air conditioning tested within manufacturer specifications with the exception of static pressure. Furnace data tag shows max static pressure of .5inwc and tested at .6inwc which is elevated. Customer did allow a brief safety check of the furnace due to its age, there are visible signs of rust, separation and cracks present, we advised customer that they are safe to use system for cooling but we would very much like to reinspect before heating season.