These large-scale windows offer an ease of operation covering a wide opening area. Dramatic, customized Lift/Roll windows can bring a room to life with light and an outdoor feeling.

Photo © Michael Moran

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.



KEY (mouse over #s to view details)

Detail: Head



Operating Assembly

Window sashes ride on carriages consisting of two sets of twin rollers mortised into the bottom of each moving sash. The sash is raised onto its carriage by rotating the operating lever handle 180°. Lifting gear connected to a tie rod transmits motion to the carriage, lifting sash. Based on G-U 933 or FFI Lift/Roll operating hardware.
- Internal carriage assembly (drive bars, wheel hub, shafts, rivets), lock kit, link rods, and connectors are zinc
- chromate coated steel or 304 stainless steel.
- Lock face and edge stile cover are clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum.
- External guides and tracks are clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum.
Egress: Properly-sized units meet egress requirements using standard hardware configuration.

Lever Handle

Standard handles are solid brass.
Finishes: Satin Nickel (US15), Polished Brass (US3), Satin Anodized Aluminum (US28).

Optional Hardware

Keyed locks.

Insect Screens

3/4" x 1/4" tubular extruded frames set in wood frame surround. 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".

Standard Configurations

X = Operable sash, O = Fixed sash, P = Pocket OX , OXXO , OXO , XP , PXXP


All glazing is per project specifications. Duratherm can accommodate most configurations and make-ups from 1/8" single glazed to a maximum of 1" security glass. Refer to the Glass and Glazing Guide in the Introduction section of this binder. Clear glass opening: Unit height minus 10 1/4". For clear glass width, contact factory.


Doubled, continuous extruded silicone flap gasket set in rebate around the perimeter of the sash. Rotating the multilatchpoint lever handle lowers the sash and 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.


Minimum: 36” for OX configuration.
Maximum: Maximum varies per configuration.


Minimum: 36”
Maximum: 66"


For OX configuation, equal-sized sashes.
Based on:
20" clear width
24" clear height
5.7 sq ft clear opening
Minimum unit width: 50"
Minimum unit height: 36"

To meet egress requirements:
At minimum unit width of: 50", height must be at least: 56"
At minimum unit height of: 36", width must be at least: 61"

Frame Depths

Standard: 6 1/4”
Minimum*: 6 1/4”
Maximum: 10”




Static Air Infiltration:
ASTM E283 cfm/ft2 @ 1.57 psf

Allowed 0.30
Test Result 0.05

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


Sash Torsion:
AAMA/WDMA/CSA 101 / I.S.2 / A440


Vertical Deflection:
AAMA/WDMA/CSA 101 / I.S.2 / A440


Forced Entry:


Thermal Transmission


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": 0.33
with Argon: 0.29