Hopper Windows
Incorporate hopper hardwood windows that tilt to the interior or exterior for increased airflow.
Matching the versatility your unique vision requires, our hopper windows can be oriented horizontally and mounted at the floor, or with a vertical orientation and mounted at the top. These windows can be adjusted for variable tilt and include releasable hinge stops to enable the window to open to a horizontal position for ease of cleaning.
Click the links on the left to download product-specific details, specifications, and CAD files.
Data Sheets
Operator
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.
Lever Handle
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.
Optional Hardware
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.
Width
Minimum: 18”
Maximum: 72″
Height
Minimum: 18”
Maximum: 96″
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″
Egress
Based on:
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″
Frame Depths
Standard: 6 1/4”
Minimum*: 5 1/2”
Maximum: 10”
(*Contact factory for frame depths less than 6 1/4″)
Static Air Infiltration: ASTM E283 cfm/ft2 @ 1.57 psf | Allowed 0.30 Test Result 0.016 |
Water Infiltration: ASTM E547-cyclic ASTM E331-static at 8 psf | Allowed 0.0 Test Result 0.0 |
Load Deflection: ASTM E330 10 sec at +60 and -60 psf | Passed |
Sash Torsion: AAMA/WDMA/CSA 101 / I.S.2 / A440 | Passed |
Vertical Deflection: AAMA/WDMA/CSA 101 / I.S.2 / A440 | N/A |
Forced Entry: ASTM F588 | Passed |
Center of Glass: | 1″: 0.29 with Argon: 0.24 |
Total Unit: | 1″: 0.35 with Argon: 0.31 |
Large Missile Impact and Cyclical Air Pressure:
|
Passed 
|
Materials
At Duratherm, you have the flexibility to choose from an extensive selection of material options. We offer a full spectrum of wood choices for both the interior and exterior, along with a variety of powder-coated aluminum clad colors for the exterior.
Hopper Details
Glazing Configurations
All types and configurations are available to use in Duratherm windows and doors. From single monolithic to triple glazing, laminated, curved-in-place, electrochromatic switchable – virtually any type or configuration commercially available – and perhaps even some that are not.
Glazing Methods
Dry Glazing
Specially developed extruded silicone gasket sets the glass by compression. Our proprietary system is long-lived, has low maintenance, and stays water resistant.
Wet Glazing
Our special silicone wet glazing compound bonds to the glass for long-lived sealing. Plus our continuous extruded silicone weatherstrip runs around the frame perimeter, and the seal is not compromised by seasonal expansion and contractions of the sash and frame.