I have to replace the Item Number: AP2921050, but do not know if I should remove the plastic foam covering from the back
Ana S for Model Number DU920PWKB0
Answer Ana, Yes you can remove the insulation from the back of the access panel, if you wish. The insulation is there for sound deadening or absorbing panel. There may be a slight increase in the operation sound level, if you don't repalce it or re install it on the access panel. Thanks