A building comprising: one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) producing waste heat; at least one cold aisle (151, 152) from which the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) draw cooling air (123, 133, 441, 451, 451) to cool the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425); at least one hot aisle (141, 142, 430) into which the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) exhaust the waste heat (114, 124); the building characterised by further comprising; f at least one gas-fueled power source (111, 121, 131) in the at least one hot aisle (141, 142, 430, 430) providing power (112, 122, 132, 461, 462, 461, 462, 461, 462) to at least some of the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425); a gas piping providing gas to, either directly or indirectly, the devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) producing waste heat; and at least one of: a quantity of the gas piping delivering gas to the at least one gas-fueled power source (111, 121, 131) in the hot aisle (141, 142, 430) sufficient to increase a temperature of gas carried by the gas piping; or gas leakage points of the gas piping in the hot aisle (141, 142, 430) and after gas ignition sources in an airstream from the cold aisle (151, 152) to the hot aisle (141, 142, 430) through the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425), the gas leakage points being any portion of the gas piping where there is a joint or connection between two physically distinct gas-carrying members that are joined or connected, or any other portion of the gas piping comprising a gasket or other type of seal, and the gas ignition sources comprising the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) and the one or more gas-fueled power sources (111, 121, 131). one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) producing waste heat; at least one cold aisle (151, 152) from which the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) draw cooling air (123, 133, 441, 451, 451) to cool the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425); at least one hot aisle (141, 142, 430) into which the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) exhaust the waste heat (114, 124); the building characterised by further comprising; f at least one gas-fueled power source (111, 121, 131) in the at least one hot aisle (141, 142, 430, 430) providing power (112, 122, 132, 461, 462, 461, 462, 461, 462) to at least some of the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425); a gas piping providing gas to, either directly or indirectly, the devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) producing waste heat; and at least one of: a quantity of the gas piping delivering gas to the at least one gas-fueled power source (111, 121, 131) in the hot aisle (141, 142, 430) sufficient to increase a temperature of gas carried by the gas piping; or gas leakage points of the gas piping in the hot aisle (141, 142, 430) and after gas ignition sources in an airstream from the cold aisle (151, 152) to the hot aisle (141, 142, 430) through the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425), the gas leakage points being any portion of the gas piping where there is a joint or connection between two physically distinct gas-carrying members that are joined or connected, or any other portion of the gas piping comprising a gasket or other type of seal, and the gas ignition sources comprising the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) and the one or more gas-fueled power sources (111, 121, 131). a quantity of the gas piping delivering gas to the at least one gas-fueled power source (111, 121, 131) in the hot aisle (141, 142, 430) sufficient to increase a temperature of gas carried by the gas piping; or gas leakage points of the gas piping in the hot aisle (141, 142, 430) and after gas ignition sources in an airstream from the cold aisle (151, 152) to the hot aisle (141, 142, 430) through the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425), the gas leakage points being any portion of the gas piping where there is a joint or connection between two physically distinct gas-carrying members that are joined or connected, or any other portion of the gas piping comprising a gasket or other type of seal, and the gas ignition sources comprising the one or more devices (110, 120, 130, 322, 410, 411, 412, 413, 313, 415, 420, 421, 422, 423, 424, 425) and the one or more gas-fueled power sources (111, 121, 131).