“Charcoal filter for 30" range hood Bought the Broan range hood and am not venting it outside, just having it recirculate. Electrician said I need a charcoal filter, but the filters I purchased were too small and interfered with the fan. Is there a part number? Shouldn't it be a charcoal filter that replaces the aluminum filter provided with the kit? Here's the model info: Broan - 30" Convertible Range Hood - Stainless Steel Model: 433004 SKU: 7052878 Thanks.”