D.C. Mun. Regs. tit. 12, r. 12-E1011
Strike Section 1011 of the International Mechanical Code in its entirety and insert a new Section 1011 in the Mechanical Code in its place to read as follows:
Explosion doors. Each boiler burning fuel in suspended or gaseous form shall have one or more self-closing explosion doors located in the boiler setting and breeching as required. This section shall apply to new installations and to existing installations that are changed to burn fuel in suspended or gaseous form.
Deflectors. Explosion doors, when located in the walls of the boiler setting within 7 feet (2134 mm) of the firing floor or of any platform or walkway, shall be provided with substantial deflectors to divert the blast of exploding gas so that it will not constitute a hazard.
D.C. Mun. Regs. tit. 12, r. 12-E1011