With our ability to mount operating lever handles at either the head or jambs, Hopper units are versatile and convenient to operate whether oriented horizontally and mounted at the floor or with vertical orientation. They can be adjusted for variable tilt into the space and can include releasable hinge stops, enabling the window to open to a horizontal position for ease of cleaning.
Wood Species & Finishes
Duratherm sources all its materials by project, only from providers we know and trust. Many of our woods come from Forest Stewardship Council® (FSC- C108949) certified sources. We obtain others from sustainably-harvested plantations. Fourteen domestic and exotic wood species offer a wide range of colors, grains, and textures.
Please contact us for information about finishing options (including paint, Sikkens, clear laquer, stain, bleach stain, oil, etc.) and to discuss the use of a species not on our standard menu. We consider availability, durability, machining, and gluing characteristics to determine the feasibility of your choices.
EXTERIOR WOOD SPECIES
INTERIOR WOOD SPECIES
We offer dry or wet weeped
Specially developed extruded silicon gasket sets the glass by compression. Our proprietary system is long-lived, has low maintenance, and stays waterproof.
Our special silicon wet glazing compound bond to the glass for long-lived sealing. Plus our continuous extruded silicon weatherstrip runs around the frame perimeter, and the seal is not compromised by seasonal expansion and contractions of the sash and frame.
DRY GLAZED WINDOW
WET GLAZED WINDOW
We use only the highest quality hardware. Our standard hardware finishes for most window operators are lacquered Red Bronze (US 20) and White Bronze (US 25). Other finishes are available on request.
HANDLES & FINISHES
KEY (mouse over #s to view details)
Zinc chromate shoot bolt connected to lever handle controls. For tall, narrow units, shoot bolt is rebated into sash stiles (one each stile); short, wide units have shoot bolt rebated into top rail. Turning the lever handle engages the shoot bolts into strike plates at the head or jambs depending on configuration.
Egress: Properly-sized units meet egress requirements using standard hardware configuration.
Operating hardware accepts any lever handle with 43mm attachment spacing and 7mm square spindle. A wide variety of styles and finishes is available from various manufacturers.
Custodial locks, sash restrictors, removable handles, remote pole operation.
1" x 1/4" tubular extruded frames in anodized bronze, mill finish aluminum or custom color painted aluminum. Mesh of 18 x 16 screen cloth held with vinyl spline, available in charcoal finished aluminum, mill finish aluminum, stainless steel or bright brass. Maximum width of screen mesh is 72". Wood-framed screens are available.
All glazing is per project specifications. Duratherm can accommodate most configurations and make-ups from 1/8" single glazed to a maximum of 1 3/4" security glass.
Clear glass opening: Unit height minus 7 3/4", unit width minus 6 3/4".
Double continuous extruded silicone flap gasket set in rebate around the perimeter of the sash. Engaging the lever handle compresses the weather-strip to ensure a tight seal.
The minimums and maximums shown are intended as guidelines. For applications that exceed these ranges, please contact the factory for assistance.
To ensure smooth and troublefree operation over time:
At maximum width of: 72", limit height to: 36"
At maximum height of: 96", limit width to: 28"
20" clear width
24" clear height
5.7 sq ft clear opening
Minimum unit width: 25"
Minimum unit height: 72"
To meet egress requirements:
At minimum unit width of: 25", height must be at least: 72"
At minimum unit height of: 72", width must be at least: 25"
Standard: 6 1/4”
Minimum*: 5 1/2”
(*Contact factory for frame depths less than 6 1/4")
Static Air Infiltration:
|Allowed 0.30 Test Result 0.016|
|Allowed 0.0 Test Result 0.0|
Center of Glass:
ASTM C-236 U-value using Viracon VE1-2M Low E glass and Lawrence Berkeley Laboratories Winow 5.2 analysis program.
|1": 0.29 with Argon: 0.24|
|1": 0.35 with Argon: 0.31|
Large Missile Impact and Cyclical Air Pressure:
Note: Contact factory for size limitations