- Fusion-welded frame and sash offers maximum strength and integrity
- Dual bulb weather stripping acts as an effective barrier to outside elements
- Unique sash design provides large viewing area
- Sash opens a full 90-degrees for safe and easy cleaning
- 7/8" high efficiency insulated glass unit sealed with Swiggle™ Seal for maximum efficiency
- Rugged locks and operators for security and weather tightness
- Fully weather stripped interlock improves security and efficiency
- Integral sloped sill for maximum water runoff
- 4000 family includes picture and awning units
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