This can happen when a fuel equipment has been incorrectly fitted, badly repaired or poorly maintained. https://www.internet.ch/info.php?a%5B%5D=%3Ca+href%3Dhttps%3A%2F%2Fwww.google.dm%2Furl%3Fq%3Dhttps%3A%2F%2Folderworkers.com.au%2Fauthor%2Ffyhnmoser275sassmails-com%2F%3Espire+gas+safety+inspection%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Fnerdgaming.science%2Fwiki%2FThe_Function_of_Gas_Designers_in_Building_Regulations_Conformity+%2F%3E