All SCP-3987 instances will vocalize constant exclamation through unknown means when powered. SCP-3987-A instances use masculine voices; SCP-3987-B instances use feminine voices. All instances are capable of purifying the air around them in a manner expected of air purifiers. The speed of the fan directly correlates to the volume of the exclamation.
The following is an interview conducted on August 20, 2014 with PoI-2919 at Site-56.
Transcript 3987-1
Interviewer: Dr. Charlotte Triana
Interviewed: PoI-2919
Foreword: Dr. Triana is a former SCP-3987-1 instance.
<Begin Log>
Dr. Triana: Good afternoon. You haven't told me your name, so I will have to refer to you as Person of Interest 2919.
PoI-2919: <strapped to its chair> It's Tony. Call me Tony.
Dr. Triana: Okay, "Tony", could you tell me the reason you built screaming air purifiers?
PoI-2919: It's one of my new art pieces. I call it "Purifying Exclamation". It's supposed to be a pun on "satisfying explanation". Clever, right? The screaming represents our internal screaming at the mundane way we live our lives. Why do you ask?
Dr. Triana: Your reckless tampering resulted in millions of dollars spent recalling the purifiers, more millions for the issuing of amnestics to make people stop hallucinating constant screaming, and bankruptcy for the Zannis company. What do you have to say for yourself?
PoI-2919: I didn't expect my art to have such a big impact.
Dr. Triana: <sternly> Why did you build screaming air purifiers, Tony?
PoI-2919: I told you, it's my new art piece representing our inner screaming and disdain for the rat race as we pace around, trying to make ends meet. All an air purifier does is drone on and on purifying air, so if it were sapient, it would probably scream in anguish over its repetitive existence.
Dr. Triana: So, to show off your "art", you sabotaged your employer's products and scared innocent customers?
PoI-2919: <tugs at its straps> It's good exposure. You wouldn't understand.
Dr. Triana: You couldn't have signed your "work", or sent a letter, or said anything about your "message"? You just let the purifiers scream for seemingly no reason?
PoI-2919: People don't look at art just to be told the meaning. They like to derive meaning from the art for themselves. Telling them the message wouldn't leave as big of an impact.
Dr. Triana: People don't buy air purifiers to appreciate art, they buy them to purify the air they breathe. You sabotaged your employer's product just to support your ego.
PoI-2919: Look, lady, all I want is to spread my work out into the world. If I have to use unorthodox methods to spread my message, than so be it.
Dr. Triana: <sighs> Okay, so did anyone else work with you on your "project"?
PoI-2919: Yeah, I told my buddy Phillip up in Colorado about my art piece. He ended up claiming all the credit. Dickhead.
Dr. Triana: Anyone else?
PoI-2919: Nah, I worked alone. I learned early on that collaboration always leads to a meager combination of both artists' talent, rather than one artist shining through.
Dr. Triana: How were you able to make them scream?
PoI-2919: Well, there isn't any reason to tell you, right? I can't have copycats copying my art, you know.
Dr. Triana: We need to know how you made your "art" because we can't stop the purifiers from screaming. That's our reason.
PoI-2919: Look, woman, I'm not going to let you destroy my art just because you don't agree with my message. Are you sure you're not with the GOC?
Dr. Triana: No. And you won't go anywhere until you tell us how to stop the screaming.
PoI-2919: I'm not gonna tell you, lady.
Dr. Triana: I'm warning you, Tony. Tell us how to stop the screaming.
PoI-2919: I said NO, lady. Forget about it.
Dr. Triana silently gets up from her seat and walks over to an instance of SCP-3987-A in the corner. She turns it on, and it begins to vocalize its exclamation.
PoI-2919: What are you trying to do? You know I can appreciate my art too, right?
Agent Brannigan, a former SCP-3987 instance, enters the room with a hammer. He hands it to Dr. Triana.
PoI-2919: Wait a minute, are you going to-
Dr. Triana begins to attack the SCP-3987 instance with the hammer. The exclamations continue.
PoI-2919: Hey, lady! You're destroying an art piece here!! Do you know how long it took me to get them to scream?!
The SCP-3987-A instance is completely destroyed, and no exclamations can be heard. Dr. Triana faces PoI-2919, still holding the hammer.
Dr. Triana: I'm only going to tell you once. Tell us how to stop the screaming.
PoI-2919 does not respond. Agent Brannigan brings in an SCP-3987-B instance into the room. He plugs it in, and it begins its vocal exclamation. Agent Triana begins to attack it.
PoI-2919: Motherfucker! Philistine! Uncultured bitch!! STOP THAT!!
Dr. Triana ignores PoI-2919 and continues to attack the SCP-3987-B instance.
<End Log>