Sparta Aluminum
Impact Rating LMI
Design Pressure +55/-65 psf
NFRC Certified
Glazing Impact-resistant glass
Made in Florida
PGT Sparta Aluminum Architectural AR4120A
PGT's value-tier aluminum impact line on the 4000-series platform.
Value-tier aluminum impact architectural-shape window in half circle, half eyebrow, eyebrow, arch, and trapezoid configurations.
Impact Rating LMI
Design Pressure +55/-65 psf
NFRC Certified
Glazing Impact-resistant glass
Made in Florida
Frame finish
White
Bronze
Custom
Impact protection, built for South Florida
The AR4120A is PGT's Sparta value-tier aluminum architectural-shape impact window, available in half circle, half eyebrow, eyebrow, arch, and trapezoid configurations for accent installations. LMI impact-rated for HVHZ installations.
- Aluminum frame engineered for strength and durability
- Large-missile impact-rated laminated glass
- Energy-efficient Low-E insulated glass options to control heat gain
- Corrosion-resistant finishes for coastal applications
- Professionally installed across South Florida by Armor Pro
Available Shapes
Representative shapes — architectural and fixed-lite units are made to order. Confirm exact shapes and sizes available for your opening at quote.
Grille Styles
1" Flat/Flat
Impact Protection
Tested to withstand hurricane wind-borne debris
Engineered Strength
Built and tested to Florida product-approval standards
Energy Efficient
Low-E insulated glass options reduce heat gain
Corrosion Resistant
Coastal-grade finishes for salt-air durability
Limited Warranty
Manufacturer warranty plus Armor Pro install workmanship
At a Glance
Frame Material
Aluminum
Design Pressure
+55/-65 psf
U-Factor
1.07–1.08
SHGC
0.3–0.77
Visible Trans.
0.1–0.82
Impact Rating
LMI
Sizes & Pressures
| Configuration | Design pressure |
|---|---|
| Architectural Shape | +55/-65 psf |
Sizes shown are actual DLO frame size.
1/2" flange frame; integral nail-fin frame type available.
Glass & Energy Performance
| Glass package | U-Factor | SHGC |
|---|---|---|
| Energy Shield Max | 1.02 | 0.3 |
U-Factor / SHGC shown without grids; add-grid values vary slightly. Confirm exact ratings for your opening at quote.
Performance Certifications
Related Products
More models in the Sparta Aluminum.
PGT Sparta Aluminum Horizontal Roller HR4110A
Horizontal Roller
See price & specs
PGT Sparta Aluminum Picture PW4120A
Fixed Window
See price & specs
PGT Sparta Aluminum Sliding Glass Door SGD4130A
Sliding Glass Door
See price & specs
PGT Sparta Aluminum Single Hung SH4100A
Single Hung
See price & specs
Comparable from Other Brands
Other architectural shape models Armor Pro installs.
Frequently Asked Questions
The AR4120A is PGT's Sparta value-tier aluminum impact architectural-shape window, made as an accent unit rather than a standard rectangle. It's available in half circle, half eyebrow, eyebrow, arch, and trapezoid shapes to fit gable ends, transoms over doors and windows, and other specialty openings. We install it in South Florida homes where you want a decorative shaped window that still meets impact code.
Yes, the AR4120A is LMI impact-rated and HVHZ-approved, so it's built with impact-resistant glass and qualifies for the High-Velocity Hurricane Zone in Miami-Dade and Broward. That means a shaped accent window in this line still meets the same hurricane code as the rest of your impact openings. We'll confirm the current approval that applies to your shape and opening at quote.
The AR4120A architectural shape carries a design pressure of +55/-65 psf, which is the LMI impact rating it shares across the Sparta line. Because these are shaped accent units, the available size depends on the specific geometry, half circle, eyebrow, arch, or trapezoid, rather than a single rectangular maximum. We'll lay out the shape and confirm the design pressure for your opening when we quote.
The AR4120A uses PGT's Energy Shield Max impact glass built on a 5/16-inch PVB interlayer, with a U-factor of 1.01 to 1.02 and an SHGC of 0.28 to 0.30 depending on whether grids are added. The laminated impact makeup also helps cut outside noise. For a sun-facing accent window, the lower SHGC package keeps heat gain down, and we'll go over the options at quote.
The AR4120A comes in two standard finishes, White and Bronze, to match the rest of your Sparta windows and doors. For grids it offers a 1-inch flat grid, which suits the clean lines of a shaped accent unit. We coordinate the finish and grid across all of your impact windows so the shaped units blend with the standard ones.
There's no flat price, because shaped windows are priced by geometry, size, the glass package and grid you choose, and the finish, plus the condition of the opening it goes into. Architectural shapes generally take more layout and trim work than a standard rectangle, which factors into labor. Armor Pro gives a free, no-obligation estimate; we'll measure the opening and price the AR4120A for your project.
Yes. Sparta is PGT's value-tier aluminum impact line, large-missile impact-rated and eligible for the High-Velocity Hurricane Zone in Miami-Dade and Broward. The glass is the same laminated impact glass the premium lines use, and the approvals are real — the line simply trims the premium sizes, finishes, and high-pressure configurations to hit a lower price. The exact rating depends on the opening, which we confirm on the quote.
What you give up with Sparta is range, not code compliance. Sparta covers the core operation styles — single hung, horizontal roller, picture, architectural shapes, and a sliding glass door — in white and bronze only, with block-and-tackle balance hardware and a narrower set of sizes and design pressures. WinGuard Aluminum adds more colors, larger sizes, higher pressures, and a broader catalog including casements, awnings, and French doors. We reach for Sparta when impact compliance is required but the budget is the binding constraint.
PGT has built impact windows and doors in Venice, Florida since 1980 and is the largest impact-window and -door manufacturer in the country. It was the first company to develop impact-resistant products that met Miami-Dade County's hurricane code after Hurricane Andrew, and the line is engineered specifically for Florida conditions. PGT is now part of the MITER Brands family, alongside WinDoor, ECO, and NewSouth, but the products are still made in Florida under the PGT name.