Abstract: An airflow reduction system includes an insulating panel assembly for sealing a window within a jamb. The insulating panel assembly has a frame configured to fit within the jamb and a glazing panel in the frame coated with a low-emissivity or solar control coating or film. The frame may include one or more cavities extending along its length. The assembly may also include a blind stop and/or a trim stop installed on either side of the frame within the jamb. A compressible seal around the external perimeter of the frame bears against the jamb to form a first barrier impeding the flow of air, and the blind stop or the trim stop forms a second barrier impeding the flow of air. Also disclosed is a mounting assembly including an insulating panel assembly and at least one bracket and a method of installing the same.

Abstract: An airflow reduction system includes an insulating panel assembly for sealing a window within a jamb. The insulating panel assembly has a frame configured to fit within the jamb and a glazing panel in the frame coated with a low-emissivity or solar control coating or film. The frame may include one or more cavities extending along its length. The assembly may also include a blind stop and/or a trim stop installed on either side of the frame within the jamb. A compressible seal around the external perimeter of the frame bears against the jamb to form a first barrier impeding the flow of air, and the blind stop or the trim stop forms a second barrier impeding the flow of air. Also disclosed is a mounting assembly including an insulating panel assembly and at least one bracket and a method of installing the same.