Attachment frame for mounting ventilation grill in opening on wall, has two horizontal side walls and two vertical side walls, where beading is provided to one of side walls to increase stability of attachment frame

摘要

The frame (1) has two horizontal side walls (3) and two vertical side walls (4), where a beading (14) is provided to one of the side walls to increase the stability of the attachment frame. The vertical side walls are arranged parallel to a longitudinal axis of the frame, and the horizontal side walls are arranged conically along the longitudinal axis of the frame, where the side walls are designed such that the side walls are positively and/or cohesively connected to each other.