GNT Quality Windows

GNT Windows deals with high quality manufacturers of Windows. We are for discerning individuals and select Architects who want to bring home building to new levels of design and energy efficiency. Our selected suppliers of products begin with the finest materials and are crafted with great care and attention to detail. You can rest assured that they are vigorously tested to exceed industry standards for efficiency and performance. For over twenty years our customers have come to appreciate the thoughtful engineering and design flexibility that GNT offers them. You too will appreciate the difference quality makes. We offer many different configurations, colours and species, chances are if you can think it we can do it.

GNT Ultra Series

Extruded Aluminum Exterior

Ultra Series products have extruded aluminum cladding on the exterior, which is durable even in the harshest weather. The aluminum includes a percentage of recycled aluminum billet, which can help meet the needs of sustainable design projects. The extruded aluminum trim is low maintenance, yet offers detailed styling similar to wood windows.

Trim Choices

Accessory grooves are integral to the extruded clad frames, allowing the addition of aluminum accessories. The extruded aluminum trim is low maintenance, yet offers detailed styling similar to wood windows. Many trims are available, such as 1-15/16" or 3" profiled brickmould, historic brickmould and sill nosing, Pavilion brickmould, extended sill nosing, ogee trim, flat casing with or without a backband, mull covers and more. Orders for customized casing are welcome as well.



30 Color Choices

Over 30 color options provide a wide array of choices for GNT Ultra Series windows and doors. 70% PVD fluoropolymer is an exceptional finish which maintains its film integrity and retains the color and gloss, as proven by the 30-year warranty extended directly to the homeowner. Custom colors are available.

Fluropolymer Finish

Fluoropolymer finish meets the performance requirements of AAMA 2605-05 -- the most stringent testing procedures for organic coatings on aluminum extrusions.

Real Wood Interior

The luxurious wood interiors of Ultra Series windows and doors are carefully crafted with Pine. To match furniture or meet a specific design goal, other wood species are available, such as Alder, Fir, Oak, Cherry, Maple, Walnut, Mahogany, Bamboo*, Lyptus, and many more.

Optional Anodized Finishes

Anodized finishes provide a unique, metallic shine by electrolytically coating the surface with an oxide film.* They are available by special order in several preselected colors or custom colors. Added charges and longer lead times may apply.

Ultra Series Crank-Out EP Casements

At GNT, we often recommend GNT Ultra Series Crank-Out EP Casements for primary residences because the triple-pane glass and construction helps meet the energy demands of Canada zone C. If your project requires double hungs to maintain architectural integrity, the addition of wide horizontal bars to casements mimics double hung check-rails, while narrower bars create the desired design element. This meets the aesthetic of double hungs while achieving the greater energy efficiency offered by casements. The personal, professional service members at GNT will help you meet the aesthetic, energy and performance needs required for your residential or commercial project.

GNT Heritage Series

Real Wood Exterior

Carefully crafted by experienced artisans, Heritage Series wood windows and doors offer the timeless charm of old-world architecture. To ensure lasting beauty, the exterior wood parts are preservative-treated, then factory-primed for painting on the job site. Many exterior trim profiles are available to create a stunning architectural statement. Custom brickmould and trims may be specified as well. Installation of windows and doors is key to their performance. Therefore, installation clips are available for top-quality installation that does not require nailing through the exterior trim and can help meet required design pressures for high wind areas.

Real Wood Interior

The fine wood interiors of Heritage Series products are crafted with Pine. To match furniture or other interior decor, other wood species are available, such as Alder, Fir, Oak, Cherry, Maple, Walnut, Mahogany, Bamboo*, Lyptus, and many more.

High Performance Exterior Finish

An extensive offering of over 30 K-Kron II colors are available. Traditional homes and store-fronts often feature bright colors, with sash in one color and frames in another color. GNT can help select colors that either blend with a neighborhood's architectural style or stand out to present dramatic curb-appeal. K-Kron II resists ultraviolet deterioration and chalking, chemical attack, as well as d amage from salt, wind, sleet and snow. As proof, a 10-year warranty is extended directly to the homeowner. The K-Kron II three-step exterior finishing system follows WDMA T.M. 12-2000 guidelines.

Heritage Series Sterling Double Hungs

At GNT, we like to recommend Heritage Series Sterling double hungs for secondary residences because the luxurious interior wood is not obscured by vinyl jamb liners or excessive hardware. Locks and tilt latches conveniently operate from a single multi-functional lever. Plus, retractable screen kits are available, so screens can be conveniently rolled out-of-sight when not in use.

GNT Classic Series

Roll-formed Aluminum Clad Exterior

When a project needs to emphasize simplicity with a streamlined appearance, Classic Series windows and doors are a natural choice. The Roll-formed aluminum clad exteriors of Classic Series products are protected by low maintenance aluminum cladding which fits tightly to the exterior wood frame and sash.

Real Wood Interior

The beautiful wood interiors of Classic Series windows and doors are carefully crafted with Pine. Other species are available such as Alder, Fir, Oak, Cherry, Maple, Walnut, Mahogany and more.

Copper Clad French Casement

Copper cladding is a custom option for Classic Series products. Like aluminum, it is roll-formed to fit tightly to the wood frame. It can be finished to retain its lustrous shine, or it can be left to form a mellow patina a timelessness characteristic of fine architecture. This French casement has a double-wide opening. That is, the two sash are housed in one frame with no mull post between them to obscure the opening. Outswing French casements are available as Ultra, Heritage and Classic Series units; inswing French casements are available as Heritage Series all-wood units. Radius-top French casements are also available for a stunning style statement.

Polyester Exterior Finish

A handful of colors have been popular choices for the exterior of windows and doors for centuries -- so we offer them on Classic Series products. Baking cures the polyester finish, helping it resist marring and fading while increasing weatherability and ensuring that the colors remain vibrant over time. This low maintenance finish is backed by a 20-year warranty.


GNT Latitude Vinyl Series
Discontinued Production
parts for service only

Replaced With Kolbe Forgent Fibreglass Hybrid Series 

Product Built using Glastra Frame Material  which produces a very strong build!
GNT Windquest PVC
Discontinued. Service parts only