Umshini wokwenza i-PU roller shutter roll, ukwakheka okuhle nomphumela wokujova. Futhi sinikeza umshini wesivinini ezimbili, 15m/min no-30m/min njengenketho.
Kulo mshini wokuvala umnyango we-PU roller, sihlinzeka ngesivinini ezimbili njengenketho:
1.15m/min, ishadi lokugeleza komshini lizoqala ukubhoboza ngaphambi kokusikwa.
Futhi emshinini ongu-30m/min, uyasika bese ushaya ngesibhakela.