shown in the fig1 3 fig1 shows the euthanasia device 10 referred to as the hen sleeper 10 the hen sleeper 10 is mounted on the trailer 12 which is transported by use of wheels 14 the hen sleeper 10 is positioned adjacent to a hen house 16 as an example an entry chute 18 is inserted through the wall of the hen house 16 for entry of hens into the hen sleeper 10 included on the entry chute 18 is a vacuum break 32 which may be a metal screen covering a hole in the chute between the hen sleeper 10 and the vacuum break 32 is positioned a first air curtain 44 the first air curtain can be a brush which extends from the top and bottom of the chute hens can easily pass between the brushes of the air curtain and enter the hen sleeper between the vacuum break 32 and the hen house 16 is a second air curtain 48 if the hen house has a negative air pressure it will tend to draw air from the hen sleeper into the hen house the vacuum break provides a path of less resistance for air to be drawn into the hen house the air curtains increase resistance to air from the hen sleeper being drawn into the hen.