High Speed definitely has head that will fold down. You may need to remove head bolts that secure the head in the up position. They are located inside the head on the bottom behind speaker panel. Keys for backslash are usually hanging by hook on inside of coindoor. Use towel, cardboard, or something to slide between head folded down and glass. This prevents head and/or trim damage. Use ratchet strap or plastic wrap to keep head secured down. Hand truck best way to move.
You can find measurements online hopefully and determine if it will fit through your narrow hallway. If you do have to take head off, label all connectors where they go. All have a number on the board where they plug into. Write that number on the side of the connector with sharpie.