Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can this unit be used as a thru wall unit. 25000btu
Document: This AC unit was ordered 5-31 and arrived 6-4 installed on 6-4 really didn't fit window properly so I used Duct tape around it in a very thick fashion. I live in a 1970 Mobile home 12x70 badly insulated but this thing cools the entire place even though its installed in a hallway. I am completely satisfied.
So, even with the fan on the low setting, the hum is loud and extremely annoying. So much so that I have removed 2 stars from my rating. I am trying to figure out if the hum is normal for this model or is it a defect in the one that I purchased, but I am leaning towards it just being a loud compressor. The Panasonic air conditioner that this unit replaced was so quiet that it's going to take some time to get used to the change.
UPDATE: 2 June 2014Have had this installed since 17 July, 2012. Worked great all summer of 2013.Started it up about a week ago and... so far so good. Still cools great. The buzzing/noise level seems high though. I'm tempted to take apart the front and see if I can deaden some of the noise.So this unit is still being used as the only A/C in the house - still haven't felt compelled to replace the 'real' AC on the roof.
If your A/C unit is big enough, you must lean it out of a doorway and let it drain, allowing the warm air from the outside to easily defeat a portion of the cooling you just paid for in precious electricity. Crazy? Yes.This season we decided to purchase a big, powerful air-conditioner that could be installed in-wall. We settled on this Frigidaire.
Awesome Service. Awesome speed and Awesome unit. Thank you Amazon.
We plugged in the unit, and nothing. Just doesn't work. Very disappointed. The package was falling apart, but the unit looked ok, so we plugged it in, and nothing.
Love the look of the unit. For something with so much power it doesn't look monstrous from inside and outside. Does an excellent job cooling the apartment and I am very pleased with the purchase I made. As always, ordering from Amazon with their quick delivery service was a great!
Found out that somehow the power was wired (not by me :) incorrectly so that only 110V's was getting to the unit. Funny enough it would light up - but no error...... Fixed that and cranked the unit on and there comes cold air. It works as expected now.The face/front panel was damaged in shipping and I'll see about getting it replaced but the unit performs as it should now.
This one is not really that useful - I had a 3rd party one that I also put in place to make sure that with 130+ lbs sticking out the window - it shouldn't fall from the 10th floor.For a unit this size be ready for the mounting - it's not an easy process. Mainly because the outer "shell" is so large and must go so far out the window.
Received the unit and set it up and the fan promptly broke when a piece of packing was missed. Getting the part replaced was a hassle as we live in the country and on close service. They have to come out look at the unit, and then order the part then come back and place it. After 2 weeks of many phone calls and very hot humid days it was repaired. The unit itself works well.
Answer: it ceretainly can! the installation instructions that come with it have instructions for both windo and through-wall installation.