ROBAM U3 30" Convertible Range Hood Specifications. So it shouldn't start rusting in a year. 1000 CFM Power. Powerful 1000 CFM for Heavy Frying & Searing. The U3's stainless steel body wipes down in seconds, the baffle filters detach and go straight in the dishwasher, and a large-capacity oil cup catches grease so it never builds up where you can't reach.