I am about to install a Jotul C450 in a week.
The fireplace is already prepped, damper cut, block-off plate fabricated, outside air system mortared into the f/place, with a nice sheet metal elbow slid over the outside end to prevent from rain and uninvited guests.
The chimney liner goes on on Memorials day, then the Jotul goes in whenever I feel like it.
Look up the user manual online, it shows the air intake location, and Jotul sells a piece of junk 3" diameter adapter thingy to be slid over the intake opening, and attached to the outside air ducting. That's what I decided to use, after an extensive research of fireplace inserts.
Otherwise, here's a list of outside air-approved inserts, rated for 1600 - 2000 square feet to heat:
Quadrafire Bodega Bay
Quadrafire 4100i
Pacific Energy Pacific
Napoleon 1402 (not only "approved" but also appropriately kitted)
There are certainly others, below and above my square footage needs, which could be used with outside combustion air, I just never bothered to look them up.
Go ask TheChimneySweep (a poster on these forums, his website is
www.chimneysweeponline.com), he knows a thing or two about outside air and inserts...
Cheers!