ation ▁and ▁cold ▁room ▁doors ▁with ▁excellent ▁ins ulation ▁values ▁was ▁also ▁introduced ▁with ▁the ▁Green ▁and ▁Energy ▁saving ▁requirements . ▁ ▁In ▁North ▁America , ▁the ▁Do or ▁and ▁Access ▁Systems ▁Man ufact uring ▁Association ▁( D AS MA ) ▁defines ▁high - per formance ▁doors ▁as ▁non - res ident ial , ▁power ed ▁doors , ▁character ized ▁by ▁rolling , ▁fol ding , ▁sl iding ▁or ▁swing ing ▁action , ▁that ▁are ▁either ▁high - cycle ▁( min imum ▁ 1 0 0 ▁cycles / day ) ▁or ▁high - speed ▁( min imum ▁ 2 0 ▁inches ( 5 0 8   mm )/ second ), ▁and ▁two ▁out ▁of ▁three ▁of ▁the ▁following : ▁made - to - order ▁for ▁exact ▁size ▁and ▁custom ▁features , ▁designed ▁to ▁be ▁able ▁to ▁with stand ▁equipment ▁impact ▁( break - away ▁if ▁accident ally ▁hit ▁by ▁vehicle ) ▁or ▁designed ▁to ▁sust ain ▁heavy ▁usage ▁with ▁minimal ▁maintenance . ▁ ▁Autom atic ▁ ▁Autom atically ▁opening ▁doors ▁are ▁power ed ▁open ▁and ▁closed ▁either ▁by ▁electric ity , ▁spring , ▁or ▁both . ▁There ▁are ▁several ▁methods ▁by ▁which ▁an ▁automatically ▁opening ▁door ▁is ▁activ ated : ▁▁ ▁A ▁sensor ▁detect s ▁traffic ▁is ▁approaching . ▁S ens ors ▁for ▁automatic ▁doors ▁are ▁generally : ▁ ▁A ▁pressure ▁sensor ▁– ▁e . g ., ▁a ▁floor ▁mat ▁which ▁react s ▁to ▁the ▁pressure ▁of ▁someone ▁standing ▁on ▁it . ▁ ▁An ▁inf ra red ▁cur tain ▁or ▁beam ▁which ▁sh