4340 Single-Hung Window

The 4340 vinyl single-hung window is a DP40 version of the popular 4300 single-hung window that offers crafted features for exceptional durability and energy efficiency for new homes that require enhanced DP ratings. With standard features that include a pre-punched mounting fin and constant-force balance system, the 4340 single-hung is made for both builders and homeowners in areas that require high-performance windows.

You don't have to sacrifice aesthetics to have durable windows for your home. MI Windows' 4340 vinyl single-hung window is available with several standard grid options, five high-performance glass packages, and a variety of colors, so you can have a beautiful window with on-trend colors and styles that is also a high performing window.

Energy Star ®


  • North-Central
  • South-Central
  • Southern
  • Welded, multi-chambered frame and sash for superior strength and energy-efficiency
  • Integral J-Channel and mounting fin with pre-punched holes for easy and efficient installation
  • True-sloping sill optimizes water drainage and eliminates unsightly weep holes
  • Metal-reinforced meeting rail, lock rail, and bottom sash rail delivers strength and durability
  • Additional metal reinforcement in sash stiles 
Product Details:
  • Multi-chamber mainframe design
  • 3-1/4” frame depth
  • 3/4" insulating glass
  • 4-9/16”, 6-9/16”, and 7-9/16" wood extension jambs available
  • Continuous head and sill mulling for twins and triples
Performance Ratings:
  • STC: 28
  • U-Value: 0.30-0.48
  • SHGC: 0.20-0.63
  • VLT: 0.39-0.66
Glass Options:
  • Low-E
  • HP Low-E
  • Tempered
  • Obscure
  • Argon gas enhanced
Interior Colors 
  • White, almond, and clay extrusion
Exterior Colors 
  • White, almond, and clay extrusion
  • Black matte and bronze paint

Color limitations may exist. Refer to product literature for more details.

View Color Options Data Sheet


Grid Options:
  • 5/8” flat grids-between-the-glass
  • 7/8” flat grids-between-the-glass
  • 11/16” sculptured grids-between-the-glass
  • 15/16” sculptured grids-between-the-glass
  • 1-1/8" simulated divided light
  • Color match
  • Optional window operating control device (WOCD)

*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.