Umatshini wokwenza umatshini we-PU roller shutter, ukwakheka okulungileyo kunye nesiphumo sokutofa. Kwaye sinikezela ngezantya ezimbini zomatshini, 15m/min kunye ne30m/min njengokhetho.
Kulo matshini wokuvala umnyango we-PU, sibonelela ngesantya ezibini njengokhetho:
I-1.15m / min, i-flow chart yomatshini iya kuqalisa ukubetha phambi kokusika.
Kwaye kumatshini we-30m/min, uyasikwa emva koko uyabetha.