Abstract: This utility model discloses a ventilation grill that consists of a face cover (1)—a ventilation grill, with inclined fins (1a), forming a grill, with deviation in the “parallel to flange” position, of a rectangular housing (2) with a flange (2a) and a preventer (6), of an air flow control mechanism (FIG. 2) that includes a louver control wheel (3) that is connected via gear transmission with the louver control mechanism (4) that synchronizes the movement of the louvers (5), and has a louver control (and thus an air flow control) mechanism differing from a lever, and has a preventer against misalignment in the installation process, a simple design in production, and better functional properties in ranges of ventilation grills for suction or suction-and-exhaust ventilation with an air flow control mechanism.

Abstract: A double-sided inspection screen which can be installed either following the front side installation mode is disclosed, or as a rear side installation model. The screen is arranged so as to provide easy opening of the cover by a slight hand push without recourse to any additional tools. Said arrangement secures quick and easy access to various communications and/or production assemblies and/or devices.

Abstract: The present invention defines the anemostat that includes: 1—control valve; 2—adjusting rod (threaded); 3—diffuser; 3?—diffuser throat; 4—frame; 5—threaded hole; 6—retaining ring (fixture element); 7—mounting tube; wherein due to the fixture element (6) connection of diffuser to the tube is ensured, at the same time the use of fixture element (6) enables to quickly mount/dismantle parts of anemostat on the ceiling without risk of breakdown of any anemostat parts resulting from skew; with no increased aerodynamic noise in case of two-level securing of the mounting tube and diffuser and; with no cause of vibration (turbulent) noise origination when the air flow increases by reason of structural design of diffuser securing to the mounting tube.