Imperial LS Double Hung Windows
The Imperial LS Double Hung window redefines beauty, comfort, energy efficiency and durability. From ergonomically designed lift rails to our Auto-Majik™ lock option, the Imperial LS is the perfect enhancement to any home.
Beveled Exterior Frame
Stunning beveled exterior frame with optional interior woodgrain sash moldings are distinctively attractive.
Stealth Sash Lock
Sash lock mechanism is concealed inside the sash profile with no visible housing or unsightly screws. This stealth design produces a handsome sash appearance that is easy to wipe clean, strong and very durable.
Recessed Tilt Latch
Tilt latch is smooth and low-profile, easy to clean and very easy to operate.
Engineered Sloped Sill
A neoprene gasket straddles a rail under compression and works with Microban® triple-fin weatherstripping for a tight seal. A mechanical interlock holds the bottom of the sash in place under severe stress. The exclusive sill dam wall is mortised into our jambs to eliminate common corner seals that frequently leak. Comfort Foam™ inside the sill is a unique thermal feature not present in most window sill designs
Ultrafab® Tri-Fin® Gold Series weatherstripping, with built-in Ultra-Fresh® antimicrobial protection, minimizes drafts, dust and pollen and fights the groth of mold on the weatherstripping material. Three sturdy polyethylene fins provide additional barriers and diversions against air and water infiltration. There are over 600” of weatherstripping in an average size double-hung window – more than twice as much protection then common windows provide.
Integral Ergonomic Lift Rail
Easy to operate ergonomically designed lift rail conforms to your fingertips for easy sash operation.
Soft-Lite uses a heavy-duty Teflon®-coated stainless-steel coil balance system. The constant force produced by our 3/4” tempered coil makes it extremely easy to raise and lower sashes with an absolute minimum of effort. Housed in a sound-deadening thermoplastic chamber for thermal improvement and cleanliness, EnduraForce™ balancers are the quietest, smoothest way to open and close a window!
Robotically Fusion-Welded Seams
Corners are fusion welded and automatically cleaned using the best robotic equipment available for the ultimate in quality consistency. Many lesser-quality vinyl and all fiberglass and wood windows are “screwed and glued” together in the seams. This creates a weak spot prone to workmanship error in one of the most critical areas of a window's design.
Strategic main-frame and sash chambers are fully insulated with softly expanding polyurethane foam insulation. Environmentally friendly and CFC-free, Comfort Foam™ has insulating properties that improve the overall thermal performance. Don’t be fooled by dubious claims of impressive thermal values of any one component of a window. Look for the overall NFRC U-value to compare one window to another thermally.
For the ultimate in durability, Kevlar®-reinforced fiberglass composite that holds screw threads better than any other material is five times stronger than steel and over 700 times better thermally than aluminum. K-Beam™ is a patent-pending exclusive feature that will not transfer heat or cold through the window as common metal reinforcement does with lesser designs.
Additional Product Lines
The ultimate combination of art, engineering and performance. Explore »
Increase energy efficiency and cut down on air infiltration. Explore »
Elegant Beauty. Thermal Efficiency. Advanced Technology. Explore »