Abstract: A chemical filter unit, which comprises a filter medium formed by laminating a plurality of fiber sheets an a housing the filter medium, and has a gas inlet open on one face of the housing and a gas outlet open on the other face substantially in opposite to the gas inlet, characterized in that gas passages to allow the flow of the gas along the surfaces of the fiber sheets are formed between the respectively adjacent fiber sheets of the filter medium from the gas outlet to the gas outlet, and that the adsorption capacity of the filter medium is 300 eq/m3 or more. It is preferable that the fibers constituting the fiber sheets are ion exchange fibers.

Abstract: An image monitoring apparatus for detecting a confined passenger in an elevator just from an image, without using a dedicated sensor. The image monitoring apparatus includes an image acquirer for acquiring an image; a door area definer for defining a door defining area for the image; a door extracter for extracting a door image from the door defining area of the image; a door open/closed state sensor for determining whether the door is open or closed; a passenger area definer for defining a passenger defining area; a passenger extracter for extracting a passenger image from the passenger defining area of the image; a passenger presence determination for determining whether a passenger is present; a decision unit for determining whether a passenger is confined in the closed space by whether the door is open or closed and the passenger presence determination; and an alarm for issuing an alarm if a passenger has been confined in the closed space.