OKNA Vinyl Replacement Windows

We install energy-efficient OKNA Precision Weld windows and Enviro-Star Windows in the Chicago area.

The OKNA Enviro-Star is our high-end replacement window. The Enviro-Star combines superb craftsmanship with an old-world look and feel. This series offers a myriad of glass and structural options to seamlessly blend with any décor while providing the utmost in energy efficiency. Since all OKNA products are custom made, you can be sure of a perfect fit every time.

The OKNA Precision Weld is an excellent value when making the choice to replace windows in your home. The Precision Weld offers clean and modern lines, high-quality craftsmanship, and many options to beautify your home while making it energy efficient. Since all OKNA products are custom made, you can be sure of a perfect fit, which translates to savings on time and labor during installation. We offer both the 400 and 800 series of Precision Weld windows.

• Maintenance free rigid multi-chamber vinyl profile
• Full 3 ¼” depth welded mainframe with beveled colonial exterior features curves that are not only beautiful, but also allow for maximum weld surface, resulting in superior strength and years of long lasting performance
• Heatseal® warm edge spacer system for excellent thermal efficiency and drastic reduction in the possibility of condensation on the inside of the window
• Full integral interlock with double weather-stripping
• A variety of hardware options that fit harmoniously into any décor
• Fiberglass mesh half-screens standard on all windows
• Optional locking screen provides an additional safety measure
• Available in Replacement and New Construction applications

Performance

Glazing Option	U-Value	SHGC	VT	CR	Energy Star Minimum*		Comparison To Energy Star Minimum
Dual Glazed
Clear Glass	0.45	0.59	0.61	45	0.30		Does not qualify
With ESP	0.28	0.29	0.53	62	0.30		7% Better
Deluxe	0.26	0.29	0.53	62	0.30		13% Better
Triple Glazed
With ESP	0.22	0.25	0.42	69	0.30		27% Better
Deluxe	0.20	0.25	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
ESP - Energy Saving Package
CIT - Currently In Test
* Northern Climate Zone
			Industry		Comparison To
	Our Windows		Minimum		Industry Minimum
AAMA Rating	R 60		R 15
Air Infiltration cfm/ft2	0.01		0.3		3000%	Better
Water Penetration mph	59		33		79%	Better
Structural Integrity mph	187		94		99%	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 result 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.

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Precision Weld 400 Series - Double Hung

• Fusion-welded beveled frame and sash for strength and durability
• Heatseal® warm edge spacer system for excellent thermal efficiency and drastic reduction in the possibility of condensation on the inside of the window
• Heavy-gauge, fully extruded handles on both sashes
• Fiberglass mesh half-screens standard on all windows
• Full integral interlock with double weather-stripping

Performance

Glazing Option	U-Value	SHGC	VT	CR	Energy Star Minimum*	Comparison To Energy Star Minimum
Dual Glazed
Clear Glass	0.46	0.60	0.63	45	0.30	Does not qualify
With ESP	0.28	0.30	0.54	62	0.30	7% Better
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
ESP - Energy Saving Package
Deluxe - ESP & Foam
* Northern Climate Zone
			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.