6.Reinstall the parts followed the above steps.
1.4 down-foam
1.Refer to 1.1 remove front panel
2.Refer to 1.2 remove Electrical box cover.
3.Refer to 1.3 open up-air duct
4.remove 5pcs screws like this picture.
5.take out down-foam duct like this pictures
6.Remove the two screws fixed under the duct air outlet.
7.take out down air duct like picture