The Stirrer Fan Cover is an OEM replacement part for GE Microwaves. It is responsible for shielding internal mechanisms during operation.  Causes of a faulty cover include normal wear over time, cracking, or warping due to exposure to high heat.  Symptoms of a problematic cover include: Excessive noise or vibration during use Reduced or uneven heating performance Gaps exposing vulnerable electrical components Loose pieces that could fall into the microwave cavity This GE replacement part is also compatible with Hotpoint, RCA, and select Kenmore models.WB06X10712 (AP4340405) replaces 1473299, AH1480811, EA1480811, PS1480811.