Flammable gas dilution

A flammable gas diluter for reliably diluting a flow of flammable gas to a concentration below the flammability limit of the flammable gas is disclosed. The diluter comprises a dilution vessel comprising an outer envelope defining a longitudinal flow passage from an inlet to an outlet; at least one air inlet assembly for directing a flow of air into the inlet of the dilution vessel; a flammable gas inlet arrangement located towards an inlet end of the dilution vessel; two gas flow generators configured to pump a flow of air into the air inlet assembly, the two gas flow generators being located upstream of the flammable gas inlet arrangement. The two gas flow generators are configured to operate as operational and backup gas flow generators. The flammable gas diluter comprises two dampers, one damper associated with each of the gas flow generators, each of the dampers being mounted between a corresponding gas flow generator and the dilution vessel. The dampers are configured to obscure a passage between the co