Sharper Image PORTAL Window Fan with 3 Speeds, Reversible Exhaust Mode, Weather Resistant, Black

I have been looking for a decent squirrel cage style window fan for years. Although this is a little on the pricey side, I think it is well worth the investment. 1st) They look to be quite well built. I love that the design of the grill, which is in a uniform rectangle. This makes it possible to cut a block of foam (preferably gray in color ~ which I did) to block the flow of air from the outside air when the fan is not in use by sandwiching into the sides of the unit in front of the grill. 2nd) I like that it was easy to apply a screen with duct tape to the outdoor side of the air intake to keep out insects. 3rd) The fact there is no remote control is a bonus because it’s one more thing to loose. 4th) The electronic buttons are intuitively easy to use and it’s a big plus that you can use it to exhaust your indoors if you burn the toast. 5th) Even on high the fans are relatively quiet. On the low settings they are nearly inaudible. 6th) I love they are weather resistant, that said I will likely construct a roof out of plexiglass to shield the unit from storms as I intend to have them available for use all year round, although in the heat of Summer I’ll forgo the hot humid outdoor air for AC. 7th) They are offered in a black color which has two advantages. First they will show little in the way of particle dirt accumulation compared to the typical white window fans which look like they need cleaning after one week use. Second, they essentially trap light which is great for the bedroom when you do not want to be disturbed by sunlight in the early morning hours. 8th) The air pattern generated by the fan is more of a directed narrow beam that excites the air thereby moving the air in the room around in contrast to the typical prop style fan which leaves stagnate zones within the living space.Cons? Maybe slightly less CFM per dollar to other window fans. That said, I am convinced that the CFM generated by this fan has greater efficiency in the way that it creates a beam of air that excites or moves around the air in the room to a greater scale.I purchased 2 because I love the design and function of the unit.Recommended.