Air Vents- Need to know the type and Model No.

Suchitapage

I have some photos of air vents in a building which has one-pipe steam system. I would like to know the type of these air vents and whether they are applicable to one-pipe steam system.

My hunch says that this might be automatic air vents, but need to confirm.

Thank you.

Regards,

Jamie Hall

Look like big Hoffman main air vents for steam. Quite suitable.

Steamhead

What model number is on those vents?

EBEBRATT-Ed

Hoffman. Should be 75 or 75H depending on the pressure.

Steamhead

Might also be 76 or 79. If the latter, they're wrong.

Suchitapage

Thanks a lot for your help

https://forum.heatinghelp.com/discussion/comment/1872366#Comment_1872366

I don't know the model no since I never been to this building. The super over there sent me these photos asking me about it. Knew they were for venting, but couldn't figure the type and model no.

Suchitapage

Thanks a lot for your help!