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Background: I just moved into a new apartment. The apartment has a heating system unlike my last one. I need help determining the purpose of this knob above one of the radiators along the wall. The knob says "Open".

This is a New York City apartment.

Any help is appreciated. Thank you! enter image description here

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  • Where are you on this planet? Oct 31 '20 at 3:13
  • @ThreePhaseEel New York City!
    – Michael
    Oct 31 '20 at 3:18
  • Appears more likely to be something associated with the window that it's apparently on the sill of as opposed to the radiator that's not even in the picture. Half of a child-proofing lock or something like that.
    – Ecnerwal
    Oct 31 '20 at 3:19
  • @Ecnerwal Oh, that's interesting, I hadn't thought of that.
    – Michael
    Oct 31 '20 at 3:21
  • why don't you move the handle in the direction of "open"?
    – jsotola
    Oct 31 '20 at 6:51
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That has nothing to do with your heating system.

That is an old telephone jack box. If you move that cover in the Open direction, you should see it uncover a 4 wire telephone jack. The slot is to allow the wire to come out while you close it back.

Here is one photo of a new one... I'll look for something better telephone jack

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