Any one know of a good book or website that teaches about furnaces, identification of fuel types, and how to inspect them, and common defects?

http://www.nachi.tv//screenshots/video126.jpg Advanced HVAC Training for Inspectors (21 CE hours)

		 $199 for InterNACHI members (limited time offer). This course is designed to teach how to inspect residential HVAC systems. Taught by a certified instructor, Bill Mele, who is an expert in HVAC and IAQ. Course includes unlimited viewing time (YOU SET YOUR LEARNING PACE), instantly-graded online final exam, 182-page full-color course book, certificate of completion, and 21 CE credits. For course outline and DISCOUNT coupon, visit http://www.nachi.org/hvacclass2008.htm. Course beginning and FINAL EXAM, go here http://education.nachi.org/show.php?course_id=55 **($399.00)

Try this it may be a good starting point.