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Either is acceptable. The one word "doorjamb" is a compound word, and "door jamb" is also frequently used.
The door jamb is the area around the inside of a door opening.
30 psi from the doorjamb decal on my 1995 Cougar.
Have you looked on the driver's side door or doorjamb for the manufacturer's sticker?
put hinges on opposite side and do the same with the doorjamb.