1 Year Limited Warranty - ETL Certified. 8" wide including the mounting edges. Use these set up with your existing hood (the blowers inside the existing hood should be removed). Super Quiet 4 Speeds Powerful Operation - 4 speeds (Quiet, I, II, III up to 800 CFM), blue-lighted soft touch electronic buttons with 2 of 1.5W energy saving cold bright LED lights.