Illini, sorry I can't help on your conversion question, but we really like the Zephyr we have, we use it over a 36" BS with 6 burners on it. We normally use it on the 2-3 settings and we can still have a conversation then, unless my head is right under the hood, then it can make it hard for me to hear, but I think that is also due to age!! We kick it up to 5 or 6 on occasion, but not to often, it has done a great job, only one time has the max (6) setting not been enough and that was when I did a steak in a cast iron pan but I had put in to much butter and oil and the smoke just came off of that pan/steak like mad. It is the only time in a just over a year that I have set off the smoke alarm in the new kitchen. But all that smoke cleared out in about 10 minutes after I kept it cranked on 6. It was more my fault for using to much oil. Would I like more CFMs, yea, but for how we cook 95% of the time the 715 is more than enough for us. Heck like I said we mostly use it on 2-3 for normal everyday cooking and it is just fine. Hitting up the wine trail a lot Illini? :) lol Phil

Taking a petulance break here for any other passing readers. As Sen. Daniel Moynihan once intended: One can have his own opinions, but not his own facts. [Actual famous quote: "You are entitled to your opinion. But you are not entitled to your own facts."] First there are facts of fluid dynamics that affect hood performance; the effects of these are published by researchers. See for example California Air Research Board publications and ASHRAE publications. A boiled-down view may be found in the first dozen of so pages of the Greenheck guide: http://www.greenheck.com/media/pdf/otherinfo/KVSApplDesign_catalog.pdf Then there are specific-to-you requirements, viz., what does my hood have to achieve in performance to keep my kitchen smoke and grease free? This question has been answered multiple times in myriad threads here dating back as far as 10 years. Please search these out. There are more requirements beyond just establishing required flow rate, notably what the blower rating has to be to achieve the flow rate requirement, and what make-up air (MUA) requirements have to be observed. Candidate search terms: capture, containment, aperture area, MUA, fan curve, duct diameter. kas

My Pa 2009 codes required make up air for anything over 400 CFM. I am getting an American Range 36 inch and the manual doesn't give an exact requirement but I have installed a Zephyr monsoon DCBL it is 715 CFM I bought the Broan Make up air unit from amazon because I needed an 8"diameter vent duct for that Zephyr unit. The HVHC guys have it installed and everything works well. The MUA duct opens when an air finger trigger is activated in the range hood duct the make up air unit is connected via 12 volt wire. The duct pulls outside air into my air return vent prior to it going into the geothermal unit to be heated. Zephyr now makes their own MUA unit identical to the Broan. The inspector was of no help in choosing anything. The HVAC guys said just get a 300 CFM range hood. Knew about makeup air but had never installed. The Appliance saleperson gave me NO guidance. I got more info here on GW in the appliance forum. I basically had to wing it myself and tell the HVAC guys what to do. Wont know about inspections until Dec or so when we get our final. This is a major gray area in my locale. I am hoping I do not have to get an air heat exchanger to warm the air prior to it loading into the main air return. This is required with some HVAC units but may not be an issue with my geothermal. And that I am not under the newer 2012 codes. I love the Zephry. BTW - very quiet.

No such thing as too much cfm, unless you're having an issue with your make-up air. Rule of thumb, a more powerful hood running at a lower speed works better than a less powerful hood working at top speed, even if the cfm are the same. If you do a search, kaseki explained why. Can't you ask the seller what comes with the Bertazoni? I put your number in the AJMadison website and got this: 36 Inch Range Hood Blower Insert 1000 CFM Blower Dual Slider Controls 4 Halogen Lights 2 x 6" Round Vertical Ducting Heavy-Duty Professional Baffle Filters I would assume it comes with an electrical cord and lightbulbs. What else do you need?Mounting brackets? I'm guessing because it's an insert, those come too, but the installer or carpenter should be able to figure it out if not. Oh! Definitions--liner is the housing. The metal box that holds the filters, lights, etc. The blower is the motor and fan assembly. Those are sometimes sold separately as people like to go truly custom. Which is a long stream of conciousness way of saying that yes, it does look like you get the whole shebang, but you should check with the seller anyway. The important thing is to make sure that the duct opening and your duct are in the same place and are the same size, or similar enough to make work.