Iyo American standard fire gonhi ine moto wekudzivirira chiyero che120 maminetsi, uye mukati makazadzwa ne perlite fire door core board. Shizha regonhi rakagadzirwa nendiro yesimbi, ndiro yesimbi isina tsvina, uye ndiro yakavharwa nefirimu. America yakajairwa magonhi emoto anoshandiswa muNorth America nedzimwe nyika nematunhu anoona UL zviyero.