This is just a guess: I think if you meet the specs and requirements of the remote blower, you should be okay. The important thing is that the size of your duct is at least the size specified for the blower. You might want to confirm that with the blower's manufacturer, if they have a customer service 800#. If your duct size is too small (usually expressed in inches diameter), you will not get the full benefit from the blower, in other words, less than the 1000 cfm. BTW, are you sure you really need all that exhaust capacity? It's really a lot, the sort of thing suitable for a lot of heavy sauteing and grilling, cooking for a big crowd on a regular basis. With all that exhaust capacity, you need to plan also for fresh air intake to compensate for the negative air pressure you will be creating. Plan on having to open a window nearby or, if you really want to get fancy, build in an air intake device inside the venting system. I don't know exactly how they do this -- it's the kind of thing usually installed in restaurants. It's easy to go overboard when planning a renovation. You have to sit back and say, what do I really need, and what will please me?

Also make sure that the switch on the insert meets the amp load and also make sure that the blower speeds mesh with the type of switch. Infinite speed blower with infinite speed switch, 3 speed swithc with 3 speed blower etc. If you put an infinite speed blower on a 3 speed switch it will only work on one speed. It will be either off or on.

Thanks for the responses. I think I need at least 900 cfm based on posts I've seen here from others not being happy with 600 cfm over their pro-style range. I'll have a 36" range with an oversized hood and do hope to plenty of sauteing, wokking, deep frying (Tempura). No grill, though. The blower is infinite speed and the prestige liner has an infinite speed switch. I'll need to check on the amps--good tip.

We were wondering if they have makeup ducts for hoods similar to the gas fireplaces that are double-walled with intake air coming in the outer ring and exhaust going up the middle. I think the vent will be going up and then into the laundry room behind the range, then out a soffit to a remote wall fan.

I'm not clear on the whole make up air thing--other than opening a window solves it. Is this something I'm going to feel when I run a powerful hood? This is our dream house/kitchen so I've only worked with small microwave with vent set up before. We are installing an HRV in our ventilation plan to make sure we have fresh air in the house and no indoor air pollution build-up; does this solve the problem?

Make up air is a tricky and expensive question. There's a faq on this forum you can look at. If you have a tightly sealed house, there's a possiblity that a powerful hood can suck the exhaust from your furnace if you don't have make-up air. Generally, you only need make-up air with hoods over 600 CFM although in cold regions like Minnesota I believe they require make-up air with anything over 300 CFM. If I were you, since you don't have a grill, I'd get a 600 CFM hood - that should be more than enough for your needs.

Without knowing the specs on your pro style range it is impossible to make a recommendation on required CFM. Remember, the CFM ratings are at zero static pressure, that is, no pressure drop due to ducting, elbows, etc. If you look at the fan curves you'll see the actual CFM drops off considerably under real world conditions.

It sounds like your setup will have one 90 deg bend. Make certain this bend is not right above the range hood as this will drastically reduce it's affectiveness and create a large amount of noise. You need to run at least several feet of straight ducting before any 90 degree bend.

Another thing to consider with mixing units is your warranty on the remote blower may be voided if you use an insert from another manufacturer.

I'd talk to your HVAC contractor about the HRV and how it's configured to see if this will solve the make-up air problem. I think they are generally setup to make a certain number of air changes per hr and it may not be sized to handle a peak demand such as running the range hood blower on high.