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.

Hopper Windows Data Sheet

Hardware

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.

Insect Screens

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.

Glazing

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".

Weather-Stripping

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.

Sizing

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")

MechanicalResults
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

Thermal TransmissionResults

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

Total Unit:

1": 0.35 with Argon: 0.31

Hurricane ImpactResults
Large Missile Impact and Cyclical Air Pressure:
  • ASTM E1996-05, ASTM E1886-05
  • Tested at 42 psf
  • Wind Zone 3, not including Dade County, FL
  • Missile Level D

Note: Contact factory for size limitations and detail modification required for hurricane certified units.

Passed

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Wood Species & Finishes

Duratherm sources all materials by project — from only providers we know and trust. Many of our woods are 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 in our standard offering. We consider availability, durability, machining, and gluing characteristics to determine the feasibility of your choices.

Exterior Wood Species

  • African Mahogany
    Exterior

  • Cypress
    Exterior

  • Honduran Mahogany
    Exterior

  • Jarrah
    Exterior

  • Redwood
    Exterior

  • Sapele Mahogany
    Exterior

  • Spanish Cedar
    Exterior

  • Teak
    Exterior

Interior Wood Species

  • African Mahogany
    Interior

  • Ash
    Interior

  • Cherry
    Interior

  • Cypress
    Interior

  • Douglas Fir
    Interior

  • Honduran Mahogany
    Interior

  • Maple
    Interior

  • Red Oak
    interior

  • Sapele Mahogany
    Interior

  • Spanish Cedar
    Interior

  • Teak
    interior

  • White Oak
    Interior

Hopper Window Detail

1HEAD

2JAMB

3SILL

Glazing

Dry Glazing

Specially developed extruded silicone gasket sets the glass by compression. Our proprietary system is long-lived, low maintenance and 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.