Some common factors for fan heater quality control:
Appearance
Quantity check
Measurement(weight & size)
Hi-pot test
Basic function test
Internal workmanship check
Rub test for rating label & Logo
Running check(5 hours)
Overheating protection test
Handy & spac-efficient for traveling
Noise checking
3M tape test for Logo
Barcode scanned test
Carton dropping test