Professional Baffle Series They employ double wall construction. Your choice of powerful blowers include internal 600 or 1000 CFM or external 600, 1200 or 500 CFM. Several standard size liners include widths of 28-3/8", 34-3/8", 40-3/8", 46-3/8", 52-3/8", 58-3/8" with a 22-1/2" depth. Custom sizes are available. Professional Ventilators can be used with most Stanisci Design hoods. It can not be used with the E-Series or I Series hoods.