Kwisigama sokuthumela ngenqanawa, 'i-reefer' ibhekiselele kwisikhongozeli esikhethekileyo esifakwe efrijini okanye inqanawa iyonke exhotyiselwe ukuthwala ezo zikhongozeli, ezakhelwe ukuthutha elwandle izinto ezinokonakala njengemifuno neziqhamo, iimveliso zobisi kunye nenyama. Izikhongozeli ezithunyelwayo zifakelwe iindlela zokulawula imozulu ukuze kugcinwe iimeko zokusingqongileyo ezizezona zilungileyo kunye nokugcina umgangatho womthwalo xa uhamba.
Ngeli xesha, iinqanawa ze-reefer zahlukile kwiinqanawa zesikhongozeli eziqhelekileyo zombini ngokobungakanani kunye nemfuneko yokusebenza. Zincinci ngokwentelekiso kwaye zifuna ukuveliswa kwamandla ombane kunye nolungelelwaniso lokuhambisa umbane ukubonelela ngenkxaso yenkqubo yokupholisa eyimfuneko kwisikhongozeli ngasinye. Ngaphandle kokunyuka kweendleko zokusebenza kunye neemfuno zokulondolozwa rhoqo, imfuno yecandelo lokuthumela ngenqanawa ikhula ngokukhawuleza.
