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OKNA 400 Series Performance - Double Hung Windows

The OKNA 400 provides leading-edge window performance, without the price tag others charge for their more modest windows.  With air penetration protection that's 400 times more effective than the industry standard, and a world of customization options, OKNA 400 Series Double-Hung windows are sure to exceed your demands.

Precision Weld Double Hung Windows

OKNA 400 Series Windows -Precision Weld

  • Ideal Windows for Every Home and Budget
  • Heavy duty frame with precision welds for increased durability
  • Triple weather stripping ensures even greater energy-efficiency
  • Designed to minimize noise and friction
  • Innovative condensation resistance and thermal performance
  • Smooth gliding open & close features
  • Tamper-proof locks and hardware offer increased peace of mind
  • Low air leakage rating
  • NFRC U-Factor: 0.28  Air Infiltration: 0.05  Solar Heat Gain: 0.30
Overview - Options & Accessories - Performance
 

Performance Options Available

          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed            
with ESP 0.28 0.30 0.54 62 0.30   7% Better than ENERGYSTAR®
Deluxe 0.26 0.30 0.54 62 0.30 13% better
Triple Glazed            
with ESP 0.22 0.26 0.43 68 0.30 27% Better
Deluxe 0.20 0.26 0.42 72 0.30 33% Better
U-Value, SHGC, VT, CR values may slightly change for windows made with GBG (Grids Between Glass)
  • SHGC - Solar Heat Gain Coefficient
  • VT - Visible Transmittance
  • CR - Condensation Resistance
  • Deluxe - ESP & Foam
  • * Northern Climate Zone
** OKNA Industry Comparison To
  Our Windows Minimum Industry Minimum
AAMA Rating (38 x 63) R50 R15  
Air Infiltration cfm/ft2 0.05 0.3 600% Better
Water Penetration mph 56 33 70% Better
Structural Integrity mph 171 94 82% Better

Water Penetration mph - Specifies wind load pressure in mph a window can withstand without leaking, under rain equivalent to 8" per hour. Structural Integrity mph - Wind load in mph a window can withstand before breaking.

All results numbers are based on tested window sample by NFRC & AAMA testing window guidelines. Use for comparison purposes only. Actual values may vary depending on installation, size of the window, and other conditions.