The present invention provides devices and methods for the impregnation of air with the vapor or aerosol of a substance in a ‘controllable manner to enable the testing or training of detection means to evaluate and quantify the presence of the substance in an enclosed volume, and iη• particular to enable production of training aids and quality assurance test items for use in canine-olfaction based security screening.

The present invention provides devices and methods for the impregnation of air with the vapor or aerosol of a substance in a ‘controllable manner to enable the testing or training of detection means to evaluate and quantify the presence of the substance in an enclosed volume, and iη• particular to enable production of training aids and quality assurance test items for use in canine-olfaction based security screening.

A flexible duct includes a hollow tube shape, at least one end, a first circumferential attachment and a second circumferential attachment integral to the at least one end, wherein the first circumferential attachment and the second circumferential attachment are each configured to independently mechanically couple the at least one end around a first inlet or a first outlet, and wherein the first circumferential attachment and the second circumferential attachment are different. A method includes providing a flexible duct, selecting one of the first circumferential attachment or second circumferential attachment of the flexible duct, and mechanically coupling the selected first circumferential attachment or second circumferential attachment around the first inlet or first outlet. A connector for a flexible duct includes a hollow tube shape extending between a first connector end and a second connector end and a first circumferential attachment and second circumferential attachment integral to the at least one end.

A flexible duct includes a hollow tube shape, at least one end, a first circumferential attachment and a second circumferential attachment integral to the at least one end, wherein the first circumferential attachment and the second circumferential attachment are each configured to independently mechanically couple the at least one end around a first inlet or a first outlet, and wherein the first circumferential attachment and the second circumferential attachment are different. A method includes providing a flexible duct, selecting one of the first circumferential attachment or second circumferential attachment of the flexible duct, and mechanically coupling the selected first circumferential attachment or second circumferential attachment around the first inlet or first outlet. A connector for a flexible duct includes a hollow tube shape extending between a first connector end and a second connector end and a first circumferential attachment and second circumferential attachment integral to the at least one end.

An exhaust vent is provided including a first portion inserted through an opening in an outer wall of a structure for fluidly connecting to an appliance to be vented within the structure, a second portion fluidly connected to the first portion at a junction and having an open end opening into the atmosphere, a flap disposed at the junction configured to open by pressure from exhaust air directed through the first portion from the appliance and allow the exhaust air to pass through the second portion and be vented through the open end to the atmosphere, and the flap is further configured to close by gravity to seal the junction between the first and second portions when no exhaust air is directed through the first portion from the appliance to prevent back airflow from the atmosphere through the open end through the second portion to the first portion.

An exhaust vent is provided including a first portion inserted through an opening in an outer wall of a structure for fluidly connecting to an appliance to be vented within the structure, a second portion fluidly connected to the first portion at a junction and having an open end opening into the atmosphere, a flap disposed at the junction configured to open by pressure from exhaust air directed through the first portion from the appliance and allow the exhaust air to pass through the second portion and be vented through the open end to the atmosphere, and the flap is further configured to close by gravity to seal the junction between the first and second portions when no exhaust air is directed through the first portion from the appliance to prevent back airflow from the atmosphere through the open end through the second portion to the first portion.

An air conditioner is provided. The air conditioner has a housing and a door panel. The housing is provided with an air inlet and a front air outlet. The front air outlet has a first air outlet and a second air outlet. The door panel is slidably arranged on the outer side of the housing. The door panel has at least one position where the door panel simultaneously shields a part of the first air outlet and a part of the second air outlet.

An air conditioner is provided. The air conditioner has a housing and a door panel. The housing is provided with an air inlet and a front air outlet. The front air outlet has a first air outlet and a second air outlet. The door panel is slidably arranged on the outer side of the housing. The door panel has at least one position where the door panel simultaneously shields a part of the first air outlet and a part of the second air outlet.

A display refrigerator or freezer comprises a refrigerated storage space. Air in the refrigerated storage space is separated from air exterior to the display refrigerator or freezer by an air curtain established by one or more fans which blow air towards one or more air outlets via a cooling heat exchanger and which recover air in the air curtain via one or more air inlets for recirculation to the one or more air outlets. The refrigerated storage space has a base shelf. One or more air inlet ducts are arranged between the one or more air inlets and the one or more fans such that the air recovered via the one or more air inlets is directed by the one or more air inlet ducts towards the one or more fans. The one or more air inlet ducts, in combination with at least a portion of the base shelf, define at least a portion of a cavity beneath the base shelf, the cavity being sealed from the air recovered via the one or more air inlet.

A display refrigerator or freezer comprises a refrigerated storage space. Air in the refrigerated storage space is separated from air exterior to the display refrigerator or freezer by an air curtain established by one or more fans which blow air towards one or more air outlets via a cooling heat exchanger and which recover air in the air curtain via one or more air inlets for recirculation to the one or more air outlets. The refrigerated storage space has a base shelf. One or more air inlet ducts are arranged between the one or more air inlets and the one or more fans such that the air recovered via the one or more air inlets is directed by the one or more air inlet ducts towards the one or more fans. The one or more air inlet ducts, in combination with at least a portion of the base shelf, define at least a portion of a cavity beneath the base shelf, the cavity being sealed from the air recovered via the one or more air inlet.