Article reference KA-02149
No, the unit cannot be rotated by 180 degrees and installed upside down. There is a level line molded into the back plate which must be kept horizontal.

Applicable to the following models:
Contour Simply Silent- C4S C4R C4SR C4TS C4TR C4TSR C4HTS C4HTR C4HTSR C4PS C4PR C4PSR
DX Range - DX100 DX100B DX100BHPT DX100BHT DX100BT DX100HTA DX100HTAP DX100PC DX100PIR DX100T DX100TCP
DX Simply Silent Range - DX100BHTR DX100BHTS DX100BPR DX100BPS DX100BR DX100BTS DX100HPTR DX100HPTS DX100HTR DX100HTS DX100PR DX100PS DX100R DX100S DX100TR DX100TS
Low Voltage Range - LV100 LV100T LV100HTA LV100HTAP LV100B LV100BHPT LV100BHT LV100BT LV100HTA LV100HTAP LV100PC LV100PIR
Simply Silent Low Voltage - LV100TS SSLV100HPTS SSLV100HPTR SSLV100HTR SSLV100HTS SSLV100PIRR SSLV100PIRS SSLV100PS SSLV100R SSLV100S SSLV100TR
Simply Silent Constant Volume - CV4S CV4R CV4SR
Simply Silent Constant Volume Low Voltage - LVCV4R LVCV4S LVCV4SR