Product review (3 stars): MUST BUY EXPENSIVE EXTENSION PIECE WITH THIS!
I gave this 3 stars because even though the "chimney" or duct cover is adjustable, it only adjusts to the height of an 8 foot ceiling.  8 ft. is a code minimum, but the average ceiling height in new construction since 2000 has been 10-11 feet and after 1994 minimum 9 ft. ceiling was standard. Therefore the fact that Cosmo makes you pay almost as much for the 21' extension piece as you would pay for the whole range hood/vent hood kit smacks of price gouging. (It is $165)  I would like to see this manufacturer/distributer Cosmo and all other distributers put in an adjustable piece (the current extension piece) that would accommodate 8-11 foot ceilings. I mean really, like they don't know this is an issue for 80% of the buyers?