Abstract: A shelf assembly is constructed of elongate members and adjustable supporting brackets. The elongate members are received within aligned pairs of apertures formed in the supporting brackets in a manner restricting the vertical movement of the elongate members. Adjustable set screws extend into each of the apertures, selectively engaging the received elongate members and preventing their inadvertent removal.

Abstract: An industrial air exhaust hood for the collection and filtering of air that is to be exhausted through ductwork. The inventive exhaust hood apparatus may be installed within a building in an installation process that does not require the creation and use of a factory customized exhaust hood configured for the specific ductwork within the building for which it is to be installed. The exhaust hood contains a hood enclosure free of obstructive structures which thereby allows for the cutting and welding of the hood enclosure to the ductwork, whereupon filter retention devices and filters are installed. The result is an exhaust hood apparatus that can be installed on-site in a single process without the need of drawings and hood customization.