Does that 6.25" duct vent to the outside? If so, then most likely you could install a 600 CFM hood - Kobe makes some models that work with a 6" duct. 600 would be adequate but not ideal for an indoor grill.

I'm assuming the duct vents to the roof. But most of the rangetops with a gas grill seem to recommend at least 900 CFM. I'm concerned 600 CFM won't be sufficient if I'm grilling a steak or a whole fish, for example.

Well, you're right - more CFM's would be better but with a 6" duct you won't find hoods with higher CFMs - Kobe might go up to 700 CFMs but I'm not sure. This is a case where you'll have to compromise - if you want the grill and can't change the duct, then you'll have to settle for less CFMs.

No it won't be sufficient. And your neighbors are likely to be pissed if you flood the building repeatedly with smoke. Don't you have a balcony on which you can do a small outdoor grill? If not, well you do have to compromise on many issues for condo living. This is likely to be one of those issues.

When the words "condo" and "remodel" come up, preferably the next words read are "all plans have been checked and will meet the condo regs and are ok with the management company and board of directors".

I agree if you can't do it inside if you have a small balcony you should look for a small gas grill. I had a small grill called patio caddie by charbroil that worked well and fit on a small balcony or porch. I got mine from amazon not sure what stores might sell it in your area but someone may since it is a product made for people like you who have small outdoor spaces to BBQ

Grills on balconies are not always legal. You'll not only have to check you condo rules, but local laws as well.

Thanks to all who have responded so far. Yes, any plans would be submitted and approved. No, BBQs on the balcony are not allowed. Hence, my dilemma!

There do appear to be some 900+CFM hoods or inserts that call for 6" duct (Calavliere, Futuro Futuro). Any thoughts on those?

In some locales, hoods above 600 CFM require make-up air (in some places the limit is even lower) so you need to check on that before installing a 900 CFM hood in an apartment.

Physics are against more than about 600 CFM moving through a 6" duct. Without it sounding like a banshee that is.

I have no clue about our duct work, we vent at 90 degrees to exit house, about 8 feet. Our "quiet" 600 CFM sounds like a locomotive when on high, and our smoke detectors always go off when I cook steaks inside.

I have the wolf df range, and I also suggest your hood be at least 6" wider than your cooktop so that it works on your outside burners.

Working within the confines of HOA will probably determine your appliance choices. At least you have some existing hood/duct work, rather than a recirculating filter system. Huge plus!

weissman: don't think LA City codes require makeup air (but will check), and in any event, in So Cal we can (and do) open the sliding door opposite the kitchen most any day of the year.

live_wire_oak: yeah, that's what I figured.

redoingit: what size Wolf range do you have (36"??) and what configuration (just burners, w/griddle, w/charbroiler??)? And whose vent hood?