Rheem heat exchanger replacement question

[dayno]

Mod#RRKA-A042JK10E

Is this very difficult. Anything special to look out for? Im going to replace one for my brother soon. Thanks in advance for any info....Dayno

[coolwhip]

Be careful not to break the articulated screw mechanism, they are really difficult to find/replace.

[dayno]

What exactly is the articulated screw mechanism? :)

[docholiday]

He's messin with ya.

[selfemployed]

Try not to damage the foil face on the insulation inside the cabinet or on the back of the vestibule panel.