As the author of the Heat Exchanger Experts® Residential Heat Exchanger Manual, Heat Exchanger Experts Inc. founder, Ellis Prach is considered one of the foremost experts when it comes to troubleshooting cracked heat exchangers. His residential furnace inspection manual will show you how to inspect heat exchangers thoroughly, yet efficiently, so that you can be satisfied you are doing the best job you can for your customers. The dependable, practical techniques shown in his manual were developed over a 40-year span of furnace inspections and installations.