.6 Razen neprepustnih vrat, vrat, odpornih na vremenske vplive (polprepustnih vrat), vrat, ki vodijo do odprtega krova, in vrat, ki morajo biti primerno neprepustna za plin, imajo vsa vrata razreda A na stopniščih, javnih prostorih in pregradah v glavnih navpičnih conah na poti za izhod v sili samozapiralno cevno lino iz takega materiala, take izvedbe in požarne odpornosti, kakor vrata, v katera je nameščena, in 150 kvadratnih milimetrov čiste odprtine, ko so vrata zaprta, nameščena pa je v spodnjem robu vrat, nasproti tečajev vrat ali ob odprtini pri drsnih vratih.
6 Except for watertight doors, weathertight doors (semi-watertight doors), doors leading to the open deck and doors which need to be reasonably gastight all "A" class doors located in stairways, public spaces and main vertical zone bulkheads in escape routes shall be equipped with a self-closing hose port of material, construction and fire resistance which is equivalent to the door into which it is fitted, and shall be a 150 mm square clear opening with the door closed and shall be inset into the lower edge of the door, opposite to the door hinges, or in the case of sliding doors, nearest the opening.