Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: do this fan Draws in cool air and  exhausts hot air or exchanges air with outside simultaneously?
Document: I purchased this about 2 mos. ago...and found it to be a good buy...especially when the weather is cool outside. I especially like the fact it exhausts hot air out and brings cool air in without having to turn the 'fan' around. I would highly recommend this for wanting just to air the house on nice days.
I did a ton of shopping, and this fan had by far the best reviews! Now after owning it for a month, i can see why. Its quiet, powerful, the remite is awesome, auto temp control feature is huge. My favorite setting is "exchange" which exhausts hit air out and brings cokd air in simultaneously!
Living in Manhattan and not wanting to put an air conditioner to block my view in this particular room, this fan served the purpose. I specifically wanted a fan to remove the hot air out of the room during the summer and allow my other fan to blow the cool air. Can easily remove and replace, when needed. Love it and for the price, a great investment!! !
Also has a handy thermostat feature, so if the room gets hot the fan turns on, and when it cools down too cool, the fan turns off. And most importantly of all, this fan is QUIET! Haven't heard any rattles or other sounds, just the hum of the fan blades. I've only had it a month now, but looking forward to a long-term relationship with this fan!
So if it is extra hot outside, and the 1st set of fans can't keep the temperature down to 74 degrees, and the temp rises above 76 degrees, then the 2nd set of fans come on and they keep the temp below 76, so far I haven't needed to use any AC!I am very pleased, and I will install the same in the second bedroom soon.
I have this Bionaire Twin Window fan in my bedroom window and it has produced cool enough temperatures for comfortable sleeping even in our recent record temperatures. Even though we've been in the high 90s, the combination of the window fan and a floor fan keep my small duplex feeling like it's air conditioned.
I use to control the temperature in my kitchen by sucking out the hot air and works great. I have it all the time with the termometer and works great.
This unit really delivers and is very quiet for a unit that has twin fans. It does a really nice job of circulating cool air from the house through the sunroom addition I had installed on the back of our home. No regrets!
this item came very quickly. (although there was some confusion as to when it actually arrived since they did not offer any shipping information. ultimately, it was on my own end that someone signed for it and neglected to let me know. point is, it did arrive quickly, so keep a look out. )fan works great. obviously it works better when the outside temp is cooler than inside temp. this fan is very easy to install, and is very user-friendly.
I am a very light sleeper and needed a quiet fan that would also keep me cool. This does exactly that. I love the auto turn off so I don't have to worry about a high electric bill from having it on all night! It was definitely worth spending a little more on.
Answer: You can have both exhaust, one exhaust and one blowing in or both blowing in.