400 Series Sliding Glass Door

Patio doors from MI Windows and Doors provide energy efficiency and aesthetic value, allowing you to seamlessly blend interior and exterior living spaces. Perfect for homes in southern regions of the U.S., the 420 aluminum sliding glass door keeps your home at a comfortable temperature with features like our warm-edge spacer system and optional glass enhancements.  

The two-paneled 420 aluminum sliding glass door is non-thermally broken and offers structural integrity and energy efficiency for warm weather climates.  Standard features such as reversible panels with double interlock and tandem steel adjustable rollers result in easy operation, allowing you to effortlessly bring the outdoor world closer. The door is also available in three-panel (430) and four-panel (440) configurations. With easy installation and smooth operation, MI's 420 sliding door is an excellent choice for your new home. 

Energy Star ®


  • Warm-edge spacer system maximizes energy efficiency and improves seal performance of insulated glass units
  • Woolpile weatherstripping aid in enhanced performance ratings
  • Tandem steel adjustable rollers for ease of operation
  • Flush-mount lock with low-profile finger pulls offer improved aesthetics
  • Two-, three-, and four-panel configurations available
Product Details:
  • 5-3/16” frame depth
  • 3/4” insulated glass

Performance Ratings:
  • U-Value: 0.50-0.70
  • SHGC: 0.22-0.67
  • VLT: 0.41-0.70
Glass Options:
  • Tempered (Standard)
  • Low-E
  • HP Low-E
Vinyl/Extruded Colors:
  • White
  • Driftwood
  • Bronze
Grid Options:
  • 5/8” flat grids-between-the-glass
  • Mortised lockset with decorative wooden pull available
  • Color-matched

Complementary Product Options

*Product availability varies by state and region. 
Consult your local building code for product approvals pertaining to your specific project.  Please contact MI for assistance.