| 摘要 |
Improved installation fins (28, 76) for window or door assemblies (88, 98) are provided which include structure (46) defining an elongated fold line (73) in the fins (28, 76). The structure (46) includes a plurality of elongated, discrete, parallel, aligned depressions (48) formed in one face (38) of the fin (28 76); the depressions (48) are oriented with the longitudinal axes thereof at an oblique angle of from about 10 DEG -40 DEG relative to the longitudinal axis of the fin (28, 76). The fins (28, 76) are preferably fabricated from aluminum, and the depressions (48) are formed therein by knurling.
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