"What is this?"
"A filter. It's a filter that you hang on a wall-mounted air conditioner. You know the air from air conditioners isn't good, right?"
"Who doesn't know that? If you're close to it, your throat gets all clogged up."
"Right. But cleaning the inside of an air conditioner isn't easy. Even if you clean it, it's questionable how clean it'll get. In short, the air coming from an air conditioner is really bad air."
"So you're going to attach this filter to the air conditioner?"
"Yes. It's simple."
"But air conditioners basically blow cold air. Will cold air still come out if you attach this?"
"It will. There's no temperature difference."
"And it's definitely purified?"
"Yes."