QuickPass C-20 HVAC Contractor Exam Flash Cards can help you learn and check your knowledge, while improving your chances at passing your exam. They are easy to read, and can be used anytime, and anywhere. You will be better prepared for the C-20 HVAC Contractor exam by studying the hundreds of questions included. With these comprehensive flashcards, you get a great review aid as you prepare for the California C-20 HVAC Contractor Exam. Features: (Percentages are Approximate) • Planning & Estimating (25%) • Fabrication, Installation & Startup (29%) • Troubleshooting, Repair & Maintenance (24%) • Safety (22%)