Click the thumbnail images below for larger screen shots. Click the "ACCB Sample Boards" button below to try actual ACCB troubleshooting boards. More information Preview ACCB Sample Boards GFB Front Back Disc Gas Fitter Basics Learn about the combustion process and how to diagnose and troubleshoot fuel side, air side and electrical side problems. Gas Fitter Basics illustrates the combustion process and related topics with straight forward explanations and graphics. It's intent is to make it easy to understand important concepts and terminology. Gas Fitter Basics is an introduction to the Gas Fitting Trade and focuses on creating a solid foundation which can be built upon readily. Learning a trade is a never ending process and well understood fundamentals make learning more advanced concepts much easier. This interactive CD-ROM is a preparation for anyone interested in entering the gas fitting trade and is an introduction to some of the immediate problems one will face in the field. Learn the basics and then develop troubleshooting skills with the 100 interactive troubleshooting boards with built in faults. Click the thumbnail images below to see screen shots of some of the boards.