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Timeless Design.

Unlimited Performance.

Replace your windows with Infinity from Marvin.
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We pioneered the fiberglass window over 20 years ago with our revolutionary Ultrex® material. And it still sets the standard in performance, appearance and durability today.

No Maintenance
Ultrex is 8x stronger than vinyl — resisting weathering, warping and thermal expansion.
Better Views
The strength of Ultrex allows narrower profiles for more daylight and expanded views.
Built for Life
Years of research and innovation have resulted in windows designed to last a lifetime.

Windows That Perform

No More Leaks
Performance-grade materials can handle the pressure of 132 MPH winds and are watertight in the toughest storms.
Energy Efficient
Our windows are ENERGY STAR qualified, reducing energy bills by 7-15% compared to homes without Infinity windows.
Smooth Operation
Our hardware is engineered to work intuitively — so advanced, you can open and close your windows with one hand.

Timeless Appearance


Enduring style and innovation for a lasting impression.
Drawing on decades of design experience
Customizable to match any home
Still looks new in 5 or 20 years

Attention to Detail


Every surface, edge and corner, thoughtfully considered.
Traditional lines and details without the maintenance
Clean, seamless corners for a classic appearance
Low-profile hardware and resilient weatherstrips
The Finishing Touch
A finish that goes well beyond the finish line.
Our acrylic finishes are 3x thicker and smoother than other windows, making maintenance a thing of the past. No sanding, scraping or painting required. Our finishes resist scratching, denting and UV degradation — which means they won’t discolor over time.
Interior Finish Options
White
Sierra
EverWood®
Exterior Finish Options
White
Sierra
Cashmere
Pebble
Bahama
Bronze
Ebony
EverWood® — the beauty of wood without the work.
Our exclusive interior wood grain option looks, feels, paints and stains like wood, but is completely low maintenance. EverWood® lets you match nearly any wood color, complementing the existing woodwork in your home.

Windows That Last

Time-tested Windows
Replace your windows once and only once with windows built to last a lifetime. They can handle Mother Nature’s worst. And they won’t warp or fade over time.
A Trusted Name
Backed by over 100 years of heritage and craftsmanship with Marvin Windows and Doors, we bring the passion and dedication of a four-generation, family-owned business to your home.
We’re Committed
We’re proud of every project we’re on, and we stand behind our work. Our windows are backed by an extended service relationship and a lifetime warranty.

Lifetime Warranty

Infinity windows are built to last, but we know life happens. That’s why they're covered by a Lifetime Warranty.
  • Ultrex Fiberglass Frame and Sash
  • Hardware
  • Glass breakage
  • Glass seal failure
  • Screens
  • No Service Fees
Comparing what really matters
Infinity Ultrex®
Fiberglass
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Other Brands
Vinyl
Buying Experience
Infinity puts the sales experience in your hands with tools to design and accurately price your windows in real-time.
A sales rep gives you a 1-2 hour sales pitch in your home and pressures you to sign a contract that day.
A sales rep gives you a 2-3 hour sales pitch in your home and pressures you to sign a contract that day.
Price
Infinity offers the best value for the price — the best windows, but not the most expensive. And we stand by our quotes.

$$$$
Price is usually saved for an in-home meeting. After “promotions” and “price drops”, they still end up being the most expensive.

$$$$$
Vinyl is a cheap alternative, but you get what you pay for — sacrificing appearance, performance and durability.

$$
Materials + Performance
Infinity’s patented Ultrex fiberglass is 3x stronger than Fibrex and 8x stronger than vinyl. It can handle Mother Nature’s worst.
Fibrex is a composite material of wood flour and vinyl which can change shape, sag and deform in heat and crack in cold.
Vinyl frames and sashes expand and contract with temperature change, causing long-term performance issues.
Warranty
Infinity windows come with a lifetime warranty — including glass and installation. No additional labor fees.
Their “lifetime” warranty is limited, and they may charge a trip fee to inspect any issues.
Many vinyl companies pop up, offer a lifetime warranty, and disappear before you can make a claim.
Infinity Ultrex®
Fiberglass
Infinity puts the sales experience in your hands with tools to design and accurately price your windows in real-time.
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
A sales rep gives you a 1-2 hour sales pitch in your home and pressures you to sign a contract that day.
Other Brands
Vinyl
A sales rep gives you a 2-3 hour sales pitch in your home and pressures you to sign a contract that day.
Infinity Ultrex®
Fiberglass
Infinity offers the best value for the price — the best windows, but not the most expensive. And we stand by our quotes.

$$$$
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Price is usually saved for an in-home meeting. After “promotions” and “price drops”, they still end up being the most expensive.

$$$$$
Other Brands
Vinyl
Vinyl is a cheap alternative, but you get what you pay for — sacrificing appearance, performance and durability.

$$
Infinity Ultrex®
Fiberglass
Infinity’s patented Ultrex fiberglass is 3x stronger than Fibrex and 8x stronger than vinyl. It can handle Mother Nature’s worst.
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Fibrex is a composite material of wood flour and vinyl which can change shape, sag and deform in heat and crack in cold.
Other Brands
Vinyl
Vinyl frames and sashes expand and contract with temperature change, causing long-term performance issues.
Infinity Ultrex®
Fiberglass
Infinity windows come with a lifetime warranty — including glass and installation. No additional labor fees.
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Their “lifetime” warranty is limited, and they may charge a trip fee to inspect any issues.
Other Brands
Vinyl
Many vinyl companies pop up, offer a lifetime warranty, and disappear before you can make a claim.
Infinity Ultrex®
Fiberglass
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Other Brands
Vinyl
Thermoplastic or Thermoset
Thermoset
Thermoplastic
Thermoplastic
Heat deflection temperature 
(ASTM D648 AT 264 PSI)
285°F
173°F
163°F
CTE (x10-6in/in/F)(LD)
(ASTM D696)
4
16
30
Reinforcement
None needed
Wood flour
Aluminum or fiberglass
Flexural Modulus (LD)
(ASTM D790)
3000 ksi
807.6 ksi
385 ksi
Impact resistance
44 MFE (in x lbf)
14 MFE (in x lbf)
-
Surface finish
Acrylic (AAMA verified)
PVC, polyester urethane, acrylics
PVC
Coating hardness
H Hardness / 35.03 Barcol
B Hardness / 15.00 Barcol
NA/substrate
Thermal conductivity*
.12
.13
.10
Infinity Ultrex®
Fiberglass
Thermoset
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Thermoplastic
Other Brands
Vinyl
Thermoplastic
Infinity Ultrex®
Fiberglass
285°F
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
173°F
Other Brands
Vinyl
163°F
Infinity Ultrex®
Fiberglass
4
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
16
Other Brands
Vinyl
30
Infinity Ultrex®
Fiberglass
None needed
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
Wood flour
Other Brands
Vinyl
Aluminum or fiberglass
Infinity Ultrex®
Fiberglass
3000 ksi
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
807.6 ksi
Other Brands
Vinyl
385 ksi
Infinity Ultrex®
Fiberglass
44 MFE (in x lbf)
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
14 MFE (in x lbf)
Other Brands
Vinyl
-
Infinity Ultrex®
Fiberglass
Acrylic (AAMA verified)
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
PVC, polyester urethane, acrylics
Other Brands
Vinyl
PVC
Infinity Ultrex®
Fiberglass
H Hardness / 35.03 Barcol
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
B Hardness / 15.00 Barcol
Other Brands
Vinyl
NA/substrate
Infinity Ultrex®
Fiberglass
.12
Renewal by Andersen Fibrex®
Vinyl/Wood Composite
.13
Other Brands
Vinyl
.10
References: Stork Technimet/Testing Corporation: #0602-15293, #0512-14889, #0704-19702, #TCT006638P. Precision Measurements and Instruments Corporation: #13043-DS. Tecton: # ESP010521P, "Test Results for Fibrex and Ultrex". Plastics Engineering Handbook of the Society of Plastics Industry, Inc. Fifth Edition. Andersen Fibrex Manual: "A High Performance, High Value Biofiber Polymer Composite Technology". Renewal By Andersen: "Fibrex Material: A Better Alternative, A Better Window".
* Highest rate of thermal conductivity shown. Test results range from .10 - .13 for vinyl/wood composite (Fibrex) and .09 - .12 for Ultrex.

From Our Home to Yours

Founded and operated out of Warroad, MN, all of our windows are American-made, built to order in our factories and shipped directly to your locally-certified Infinity installation team in your community.
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