This CE centrifugal series including 2 model, EX-YB 100R and EX-YB 100F The main difference is the basement. EX-YB 100R There is steel plate in the middle of the grills for walking EX-YB 100F the basement is composed with all grills And for this series, it is economical the panel is 50mm EPS with 0.3mm steel, and the fans are centrifugal fan, 2pcs 3kw for intaking, and 1pc 4kw for exhausting. the burner is Italy BT14