Perimeter strip for magnetically attractable extruded plastic window system

In an auxiliary window system for a prime window, in which system:

• (1) a perimeter strip is applied to the edge of a glazing pane along a portion of the perimeter thereof, receiving a portion of the pane edge in a longitudinally extending channel therein, which channel in cross-section is formed by upper and lower channel forming segments of an integral member;
• and
• (2) the perimeter strip includes a magnetically attractable means adjacent and essentially parallel to the channel forming segment of the perimeter strip, which magnetically attractable means longitudinally co-extends along an outer surface of said channel forming segment;
• and
• (3) said magnetically attractable means is for attachment with respect to corresponding magnetic attraction means applied adjacent the perimeter of the prime window,
• the improved perimeter strip which includes:
• (4) longitudinally extending inwardly facing resilient gaskets on the inner surfaces of the pane edge receiving channel formed by the upper and lower cross-sectional segments of the integral perimeter strip member;
• and
• (5) resilient gasket feather means integrally applied to an outer surface of the channel forming segment of the perimeter strip member on a side of the channel forming segment facing the magnetically attractable means which is adjacent thereto, said gasket feather means (a) longitudinally coextending along said outer surface (b) in a sealing relationship with said magnetically attractable means and (c) providing a flexibly tensioned relationship between said channel forming segment and the magnetically attractable means adjacent thereto.