▁there ▁is ▁more ▁or ▁less ▁of ▁a ▁gap ▁on ▁the ▁pivot ▁side ▁as ▁well ▁as ▁the ▁opening ▁side . ▁In ▁some ▁cases ▁the ▁pivot ▁is ▁central , ▁creating ▁two ▁equal ▁open ings . ▁ ▁High - speed ▁door ▁ ▁A ▁high - speed ▁door ▁is ▁a ▁very ▁fast ▁door ▁some ▁with ▁opening ▁spe eds ▁of ▁up ▁to ▁ 4   m / s , ▁mainly ▁used ▁in ▁the ▁industrial ▁sector ▁where ▁the ▁speed ▁of ▁a ▁door ▁has ▁an ▁effect ▁on ▁production ▁log istics , ▁temperature ▁and ▁pressure ▁control . ▁high - speed ▁clean ▁room ▁doors ▁are ▁used ▁in ▁ph arma ce ut ical ▁indust ries ▁for ▁the ▁special ▁cur tain ▁and ▁st ain less ▁steel ▁frames . ▁They ▁guarantee ▁the ▁tight ness ▁of ▁all ▁access es . ▁The ▁powerful ▁high - speed ▁doors ▁have ▁a ▁smooth ▁surface ▁structure ▁and ▁no ▁pro tr ud ing ▁edges . ▁Therefore , ▁they ▁can ▁be ▁easily ▁clean ed ▁and ▁depos iting ▁of ▁particles ▁is ▁largely ▁ex cluded . ▁ ▁High - speed ▁doors ▁are ▁made ▁to ▁handle ▁a ▁high ▁number ▁of ▁open ings , ▁generally ▁more ▁than ▁ 2 0 0 , 0 0 0 ▁a ▁year . ▁They ▁need ▁to ▁be ▁built ▁with ▁heavy - d ut y ▁parts ▁and ▁counter bal ance ▁systems ▁for ▁speed ▁enh ancement ▁and ▁emer gency ▁opening ▁function . ▁The ▁door ▁cur tain ▁was ▁originally ▁made ▁of ▁P VC , ▁but ▁was ▁later ▁also ▁developed ▁in ▁al umin ium ▁and ▁ac ry lic ▁glass ▁sections . ▁High ▁Speed ▁re fr iger