Double-Hung Windows
Our luxury double-hung hardwood windows feature two operable sashes or a custom operation based on your specification.
Both the lower sash and the upper sash can be opened for efficient ventilation. Beautifully crafted with rich wood species, hardwood double-hung windows deliver versatile styling and optimal performance for your unique design.
Click the links on the left to download product-specific details, specifications, and CAD files.
Data Sheets
Meeting Rail Latch
Oxidized bronze alloy. Located at the center of the meeting rail, the latch’s cam action manually draws the sash into a locked position.
Finishes: Oil-rubbed Bronze (US10B), Lacquered Red Bronze (US20A), White Bronze (US26D).
Balances
Standard: Ultralift 88L series 670 heavy duty tube / spring balances, Heavy Duty BSI, or Amesbury Group fully concealed block and tackle balances mortised into the stiles of the operable sash.
Custom: Traditional weight and chain or clock spring balance systems are available on a custom basis. Contact factory for more information
Sash Locks (Included for oversized units)
Oxidized bronze alloy at midpoint of sash stiles. Turning the side latch compresses the weather-strip and locks the sash at each jamb.
Finishes: Oil-rubbed Bronze (US10B), Lacquered Red Bronze (US20A), White Bronze (US26D).
Egress: Properly-sized units meet egress requirements using standard hardware configuration.
Optional Hardware
Custodial locks, sash restrictors.
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: 36”
Maximum: 96″
Egress
Based on:
20″ clear width
24″ clear height
5.7 sq ft clear opening
Minimum unit width: 25″
Minimum unit height: 68″
To meet egress requirements:
At minimum unit width of: 25″, height must be at least: 68″
At minimum unit height of: 68″, width must be at least: 25″
Frame Depths
Standard: 6 1/4”
Minimum*: 6 1/4”
Maximum: 10”
Static Air Infiltration: ASTM E283 cfm/ft2 @ 1.57 psf | Allowed 0.10 Test Result 0.007 |
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 | N/A |
Vertical Deflection: AAMA/WDMA/CSA 101 / I.S.2 / A440 | N/A |
Forced Entry: ASTM F588 | Passed |
Center of Glass: ASTM C-236 U-value using Viracon VE1-2M Low E glass and Lawrence Berkeley Laboratories Window 5.2 analysis program. | 1″: 0.29 with Argon: 0.24 |
Total Unit: | 1″: 0.34 with Argon: 0.30 |
Large Missile Impact and Cyclical Air Pressure:
|
Passed 
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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.
Tilt / Turn 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.