Abstract: Air curtain with an auxiliary stream, which is used to protect rooms against the impact of external factors (weather conditions, volatile substances, particulate solids, insects etc.), as well as to protect rooms against the outflow of internal air outside. The air exhausts form at least two separate air streams, the main stream is directed towards the construction hole at the limit of the room, while the auxiliary stream is directed into the room at an acute angle in relation to the plane of the construction hole. The main stream and the auxiliary stream do not cross each other.

Abstract: An anchor bolt comprising a main body (4), a bolt head (5), at least one supporting blade (6), an internal thread (2); and an external thread (3); wherein the external thread (3) is disposed along the external surface of the main body (4); the internal thread (2) is disposed along the internal surface of the main body (4) and/or the bolt head (5); and the supporting blade is attached to the main body and the bolt head (5).