Abstract: The invention relates to a stunning facility (10) for two-stage stunning a slaughter animal (12) by means of a pre-stunning gas (14) and a final stunning gas (16), comprising a stunning channel (18) comprising an entrance opening (20) and an exit opening (22) for providing a gas atmosphere which stuns the slaughter animal (12), a conveying device (46) passing through the stunning channel (18) for conveying the slaughter animal (12) through the stunning channel (18) in a transport direction (48) from the entrance opening (20) to the exit opening (22), a pre-stunning gas supply (28) for supplying the pre-stunning gas (14) into the stunning channel (18), a final stunning gas supply (32) for supplying the final stunning gas (16) into the stunning channel (18), a gas discharge (36) disposed in the transport direction (48) between the pre-stunning gas supply (28) and the final stunning gas supply (32) for discharging the gas atmosphere from the stunning channel (18), and a recovery system (44) connected to the gas