For Professionals
Technical Reference
Specifications, options, and performance data for contractors, architects, and builders. Everything you need to spec, sell, and install.
Series Overview
Four product lines, each engineered for a different need. Every product is manufactured to order in our Garden Grove facility.
Onix Series
Black virgin vinyl profile, engineered to withstand temperatures up to 200°F with optimal resistance to warping.
- Black virgin vinyl, solid color throughout the profile
- Withstands temperatures up to 200°F
- Anti-warp engineering for extreme climates
- Multi-chambered construction for energy efficiency
Imperial Series
Premium vinyl line delivering superior energy efficiency and refined aesthetics for residential and commercial applications.
- Premium multi-chambered vinyl profiles
- Cardinal 366 Low-E glass standard
- Fusion-welded uPVC construction
- Steel and aluminum reinforced sashes
GS Series
Quality vinyl construction with reliable performance. Energy-efficient design at an accessible price point for every project.
- Heat-reducing multi-chambered profiles
- Cardinal 366 Low-E glass standard
- Fusion-welded uPVC joints
- Dual nylon composite rollers
Aluminum Series
Durable aluminum frames for commercial and contemporary residential applications. Clean sightlines with structural integrity.
- Extruded aluminum construction
- Thermal break technology
- Clean, narrow sightlines
- Commercial-grade hardware
Glass Options
All glass options are available across our vinyl series. Cardinal 366 Low-E is standard on every window and door.
Cardinal 366 Low-E
Standard high-performance Low-E glass. Reduces heat transfer up to 3x compared to standard single pane windows.
TriplePane Glass
Three glass layers with Duralite spacers, two argon gas-filled inner chambers, and 2 LoE3 glass panes for maximum energy efficiency and sound reduction.
DuraPane Laminated Glass
Impact-resistant glass with a plastic safety interlayer, similar to automotive windshield construction. STC ratings of 34-36 for superior sound reduction.
Tempered Glass
Safety glass required for certain applications. Breaks into small, rounded pieces rather than sharp shards.
Obscure Glass
Textured glass for privacy. Available in Delta Frost, Glue Chip, Rain, and other patterns.
Tinted Glass
Available in Grey and Bronze tints to reduce glare and solar heat gain.
Cardinal LoE3-366: The Science Behind the Glass
Every Lexmark window ships with Cardinal LoE3-366, a triple-layer silver coating that delivers solar control performance previously only possible with tinted or reflective glass, while maintaining a clear, neutral appearance.
How It Works
LoE3-366 uses three layers of silver separated by anti-reflective dielectric layers, applied to the #2 surface of the insulated glass unit. This triple-silver stack selectively filters the solar spectrum: it transmits visible light while reflecting infrared heat and blocking ultraviolet radiation. The result is a window that lets you see clearly while rejecting the energy that drives up cooling costs.
Energy Efficiency Benefits
Reduced Cooling Costs
With an SHGC of 0.27, LoE3-366 rejects nearly three-quarters of the sun's heat before it enters your home. In Southern California's climate, this translates to significantly lower air conditioning usage and reduced energy bills year-round, especially on south and west-facing windows.
Superior Insulation
The low U-factor of 0.29 (with argon gas fill) means heat stays where you want it: inside during winter, outside during summer. Combined with Lexmark's multi-chambered vinyl profiles and Duralite warm-edge spacers, the complete window system minimizes thermal bridging and condensation.
Fading Protection
95% UV blockage protects interior furnishings, hardwood floors, artwork, and fabrics from sun damage and fading. Unlike tinted glass, LoE3-366 provides this protection without darkening your view or altering interior color perception.
Year-Round Comfort
By reflecting radiant heat back toward its source, LoE3-366 reduces cold spots near windows in winter and hot spots in summer. Occupants feel more comfortable at greater distances from the glass, making the full room usable regardless of season.
Code Compliance
LoE3-366 meets or exceeds ENERGY STAR requirements for all U.S. climate zones, California Title 24 energy standards, and NFRC certification requirements. When combined with argon gas and Lexmark's thermally broken frames, the system is ready for the most demanding energy codes.
Outperforms Tinted Glass
Traditional grey or bronze tinted glass reduces heat by absorbing it, which re-radiates into the room. LoE3-366 reflects solar heat instead of absorbing it, delivering better performance with higher visible light and no color distortion. Your view stays clear and true.
Privacy & Decorative Glass
Obscure 
Rain 
Glue Chip 
Delta Frost 
Bamboo 
Acid Etch 
Grey Tint 
Bronze Tint Grid Patterns
Flat and sculptured grids available in a variety of patterns. Grids are installed between insulated glass layers for easy cleaning.
Colonial
Traditional grid pattern dividing the glass into equal rectangular panes.
Perimeter
Grid lines only around the perimeter of the glass, leaving the center open for an unobstructed view.
Double Perimeter
Two rows of grid lines around the perimeter for a more detailed traditional look.
Queen Anne
Decorative grid pattern with detailed corner accents for an elegant, classic appearance.
Double Queen Anne
Enhanced Queen Anne pattern with double the decorative detail at the corners.
Flat Grids
Low-profile 5/8" grids installed between insulated glass layers for easy cleaning.
Euro Raised Grids
Elevated sculptured grids that simulate the look of individually glazed panes.
Hardware
All hardware is color-matched to the frame. Available in White and Almond for vinyl series.
Hung Windows
Cam-Action Lock
One-touch close and lock mechanism that automatically seals the window.
Vent Latch
Allows adjustable ventilation with the sash partially open.
Tilt Latches
Release mechanism for tilting the sash inward for cleaning.
Constant Force Balance
Counterweight system for smooth, reliable sash operation.
Sliding Windows
Cam-Action Lock
One-touch close and automatic locking mechanism.
Integral Pull Rail
Built-in handle for easy sash operation.
Nylon Rollers
Dual nylon composite rollers for smooth, quiet gliding.
Weep System
Designed to prevent water and debris from accumulating.
Casement & Awning Windows
Multi-Point Lock
German-designed stainless steel multi-point locking for superior security.
Folding Crank Handle
Streamlined crank handle that folds flat when not in use.
Stainless Steel Hinges
Durable hinges allowing full 90-degree opening.
Operator Crank
Smooth crank mechanism for easy one-hand operation.
Sliding Patio Doors
Multi-Point Lock
Security locking at multiple points along the frame.
Flush-Mount Handle
Low-profile interior and exterior handle set.
Tandem Steel Rollers
Heavy-duty dual roller system for smooth, quiet operation.
Foot Lock
Secondary security lock at the base of the door.
French Swing Doors
Multi-Point Lock
European-style multi-point locking for maximum security.
Lever Handle Set
Matching interior and exterior lever handles.
Adjustable Hinges
Three-way adjustable hinges for precise door alignment.
Flush Bolt
Secures the inactive door panel at top and bottom.
Hardware Colors
White 
Almond Frame Colors
Standard extruded vinyl colors with matching hardware. Custom exterior colors available on request.
Vinyl Series
Aluminum Series
Product Spec Sheets
Thermal performance, structural ratings, and technical specifications for every product. All values per NFRC 100 conditions with LoE3 glass, Duralite spacer, and Argon gas fill.
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 3-1/4" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Steel reinforced sashes |
| Glass Unit | 1" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Max Size Tested | 43-11/16" x 74-3/4" |
| Structural Rating | LC PG 30 |
| DP Rating | 30 |
Thermal Performance Ratings
| Glazing | U-Factor | SHGC (no grids) | SHGC (with grids) | VT (no grids / grids) | CR |
|---|---|---|---|---|---|
| Triple Pane | .20 | .18 | .16 / .15 | .35 / .31 / .27 | 68 |
| DuraPane | .27 | .20 | .18 / .16 | .46 / .41 / .36 | 64 |
U-Factor and SHGC: lower is better. VT (Visible Transmittance): higher is clearer. CR (Condensation Resistance): higher is better. Values per NFRC 100.
Note: The thermal performance ratings shown are generic industry standard values for reference purposes. Lexmark Windows product-specific NFRC ratings are currently in the testing stage and will be available soon.
Sound Transmission Class (STC) Ratings
| Glazing | IG Width | Glass 1 | Glass 2 | Glass 3 | STC Rating |
|---|---|---|---|---|---|
| Triple Pane | 1" | 3/32" | 3/32" | 3/32" | 30 |
| DuraPane | 1" | 1/8" | 1/4" Lami | — | 33 |
Higher STC rating = better sound reduction. DuraPane laminated glass significantly improves sound performance.
Certifications & Compliance
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 3-1/4" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Steel and aluminum reinforced sashes |
| Glass Unit | 1" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Max Size Tested | 70-15/16" x 56-1/16" |
| Structural Rating | LC PG 25 |
| DP Rating | 25 |
Thermal Performance Ratings
| Glazing | U-Factor | SHGC (no grids) | SHGC (with grids) | VT (no grids / grids) | CR |
|---|---|---|---|---|---|
| Triple Pane | .21 | .18 | .16 / .15 | .35 / .31 / .27 | 67 |
| DuraPane | .28 | .20 | .18 / .17 | .47 / .42 / .37 | 64 |
U-Factor and SHGC: lower is better. VT (Visible Transmittance): higher is clearer. CR (Condensation Resistance): higher is better. Values per NFRC 100.
Note: The thermal performance ratings shown are generic industry standard values for reference purposes. Lexmark Windows product-specific NFRC ratings are currently in the testing stage and will be available soon.
Sound Transmission Class (STC) Ratings
| Glazing | IG Width | Glass 1 | Glass 2 | Glass 3 | STC Rating |
|---|---|---|---|---|---|
| Triple Pane | 1" | 3/32" | 3/32" | 3/32" | 28 |
| DuraPane | 1" | 1/8" | 1/4" Lami | — | 34 |
Higher STC rating = better sound reduction. DuraPane laminated glass significantly improves sound performance.
Certifications & Compliance
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 3-1/4" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Steel reinforced frame |
| Glass Unit | 1" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Max Size Tested | 70" x 60" |
| Structural Rating | LC PG 25 |
| DP Rating | 25 |
Thermal Performance Ratings
| Glazing | U-Factor | SHGC (no grids) | SHGC (with grids) | VT (no grids / grids) | CR |
|---|---|---|---|---|---|
| Triple Pane | .19 | .19 | .17 / .16 | .37 / .33 / .29 | 74 |
| DuraPane | .26 | .21 | .19 / .17 | .49 / .44 / .39 | 65 |
U-Factor and SHGC: lower is better. VT (Visible Transmittance): higher is clearer. CR (Condensation Resistance): higher is better. Values per NFRC 100.
Note: The thermal performance ratings shown are generic industry standard values for reference purposes. Lexmark Windows product-specific NFRC ratings are currently in the testing stage and will be available soon.
Sound Transmission Class (STC) Ratings
| Glazing | IG Width | Glass 1 | Glass 2 | Glass 3 | STC Rating |
|---|---|---|---|---|---|
| Triple Pane | 1" | 3/32" | 3/32" | 3/32" | 28 |
| DuraPane | 1" | 1/8" | 1/4" Lami | — | 33 |
Higher STC rating = better sound reduction. DuraPane laminated glass significantly improves sound performance.
Certifications & Compliance
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 3-1/4" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Steel reinforced sash and frame |
| Glass Unit | 1" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Max Size Tested | 32" x 59" |
| Structural Rating | C PG 30 |
| DP Rating | 30 |
| Locking Hardware | German-designed stainless steel multi-point lock, 90° opening |
Certifications & Compliance
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 5-5/8" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Steel and aluminum reinforcement |
| Glass Unit | 1-3/16" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Configurations | XO, OX, OXOL, OXOR, OOX, XOO, XOX, OXXO (2, 3, or 4 panel) |
| Rollers | Adjustable nylon wheel rollers with galvanized steel housing |
| Locking System | Ergonomic handle with dual-point locking system |
| Threshold | ADA-compliant threshold available |
Thermal Performance Ratings
| Glazing | U-Factor | SHGC (no grids) | SHGC (with grids) | VT (no grids / grids) | CR |
|---|---|---|---|---|---|
| Triple Pane | .21 | .17 | .15 / .14 | .33 / .29 / .25 | 65 |
| DuraPane | .27 | .19 | .17 / .15 | .44 / .39 / .35 | 62 |
U-Factor and SHGC: lower is better. VT (Visible Transmittance): higher is clearer. CR (Condensation Resistance): higher is better. Values per NFRC 100.
Note: The thermal performance ratings shown are generic industry standard values for reference purposes. Lexmark Windows product-specific NFRC ratings are currently in the testing stage and will be available soon.
Certifications & Compliance
General Specifications
| Frame Material | Multi-chambered heavy duty extruded vinyl (uPVC) |
| Frame Depth | 5-5/8" |
| Frame Types | Retrofit, Block, Nail-on (1" and 1-3/8" setback) |
| Corner Construction | Fusion welded corners |
| Reinforcement | Aluminum panel reinforcement |
| Glass Unit | 1-3/16" insulated glass unit |
| Standard Glass | Cardinal LoE3 glass, Argon gas filled, Duralite spacer |
| Standard Colors | White, Almond |
| Configurations | SWO or SWI: XL, XR, SXL, SXR, XX, and more |
| Locking System | Ergonomic handle with multi-point locking system |
| Hinges | Commercial grade continuous hinges, adjustable, non-removable pin |
| Operation | In-swing or out-swing |
| Side-lites | Fixed or operable side-lites available |
| Handle Finishes | Almond, Dark Bronze, Brushed Chrome, Bright Brass |
Certifications & Compliance
Resources
Product Specifications
Detailed dimensions, U-factors, SHGC ratings, and structural performance data for every product.
Installation Guides
Step-by-step installation manuals with technical drawings and best practices.
Glass & Energy Data
Complete glass performance data, energy certifications, and NFRC ratings.
Warranty Information
Lifetime warranty details, coverage, and claims process.
Need Technical Support?
Our team can help with specifications, custom configurations, and project planning.