Picture Windows
Direct-glazed fixed windows in 78 or 106 mm frames, all-wood or aluminum-clad, in rectangles, combinations and custom shapes. Tested to CW-PG70 up to 60 × 98 in and CW-PG55 up to 123 × 118 in. Larger engineered units go to 228 × 228 in after review.
- U-factorHow fast heat passes through the whole window. Lower is better insulation. US values are in Btu/h·ft²·°F.
- Not published
- Btu/h·ft²·°F, whole window
- SHGCSolar heat gain coefficient: the share of the sun’s heat that gets through, from 0 to 1. Lower keeps homes cooler.
- Not published
- Solar heat gain coefficient
- VTVisible transmittance: the share of daylight that gets through, from 0 to 1. Higher means brighter rooms.
- Not published
- Visible transmittance
- RatingThe NAFS performance class and grade, e.g. CW-PG70. Shows the loads the window passed in testing.
- CW-PG55
- Design pressureThe wind load, in pounds per square foot, a window is rated to resist. Upper floors, corners and coastal sites need more.
- Not published
- STC / OITCSound transmission class: how well the window blocks speech-range noise. Higher is quieter; 32 and up is noticeably quiet.
- Not published
- ImpactTested to withstand wind-borne debris (ASTM E1886/E1996). Required in hurricane debris regions unless shutters are used.
- Not published
Sections, details and photos
Renders (4)
All-wood, 78 mm, double glazed. Image: Fenstür. 
Wood-aluminum clad, 78 mm, double glazed. Image: Fenstür. 
All-wood, 106 mm, triple glazed. Image: Fenstür. 
Wood-aluminum clad, 106 mm, triple glazed. Image: Fenstür.
Sections and details (2)
Custom shape: octagonal, in the factory. Image: Fenstür. 
Custom shape: arched combination, in the factory. Image: Fenstür.
Testing (4)
Water penetration test, full-size unit. Image: Fenstür. 
Structural test rig. Image: Fenstür. 
Deflection gauge set-up. Image: Fenstür. 
Deflection reading. Image: Fenstür.
Installed (10)
Installed, curved window wall. Image: Fenstür. 
Installed, Bowen Island. Image: Fenstür. 
Picture and tilt-and-turn combination, Bowen Island. Image: Fenstür. 
Installed in cedar shingles. Image: Fenstür. 
Corner arrangement. Image: Fenstür. 
Installed, Green Point kitchen. Image: Fenstür. 
Custom shape: round, installed. Image: Fenstür. 
Custom shape: round, interior. Image: Fenstür. 
Custom shape: gable, Tofino interior. Image: Fenstür. 
Custom shape: gable, Tofino exterior. Image: Fenstür.
Specifications
| NAFS ratingPerformance class and grade under the North American Fenestration Standard, e.g. CW-PG70. Shows the loads the window passed in testing. | CW-PG55 |
|---|---|
| Design pressureThe wind load, in pounds per square foot, a window is rated to resist. Upper floors, corners and coastal sites need more. | Not published |
| Air infiltrationAir that leaks through a closed window under test pressure, in cubic feet per minute per square foot. Lower is tighter. | Not published |
| Water test pressureThe wind pressure at which the window kept water out in testing. Higher resists wind-driven rain better. | Not published |
| ImpactTested to withstand wind-borne debris (ASTM E1886/E1996). Required in hurricane debris regions unless shutters are used. | Not published |
| U-factor (whole window)How fast heat passes through the whole window. Lower is better insulation. US values are in Btu/h·ft²·°F. | Not published |
|---|---|
| SHGCSolar heat gain coefficient: the share of the sun’s heat that gets through, from 0 to 1. Lower keeps homes cooler. | Not published |
| Visible transmittanceVisible transmittance: the share of daylight that gets through, from 0 to 1. Higher means brighter rooms. | Not published |
| STC / OITCSound transmission class: how well the window blocks speech-range noise. Higher is quieter; 32 and up is noticeably quiet. | Not published |
| GlazingThe number of glass panes in the sealed unit: double, triple or quad. More panes insulate better and weigh more. | Double, Triple, Quad |
| Thermal breakAn insulating strip separating the inside and outside of an aluminum frame. Without one, aluminum cannot meet most energy codes. | n/a |
Product
- FrameThe frame material. Aluminum-clad wood has a timber frame with an aluminum skin outside; all-wood shows timber on both faces.
- Aluminum-clad wood or All-wood
- Frame depthHow thick the frame is from inside to outside. Deeper frames hold thicker glass and usually insulate better.
- 78 mm or 106 mm
- OperationHow the window opens: casement, awning, hung, sliding, tilt-turn or fixed. The symbols show the hinge side or travel direction.
- Fixed
- InstallationHow the unit attaches to the opening: nail fin, flush fin, block frame or replacement insert.
- Block frame
- Max tested sizeThe largest unit the manufacturer tested at its rating. Bigger units may need engineering or a lower rating.
- 123 × 118 in
- CSI sectionThe MasterFormat section architects file the product under in a specification, e.g. 08 52 00 for wood windows.
- 08 52 00
- BIM / CADDrawing and model files (Revit, DWG) architects can place in their plans.
- Not published
- Typical lead timeTypical weeks from a confirmed order to delivery. Custom wood and clad lines usually take longest.
- Not published
- Price tierRFV’s relative price band, from $ to $$$$, comparing installed cost per opening within residential windows.
- Not published
- CertificationsCertified by the Passive House Institute as a component for very low-energy buildings in a stated climate.
- Not published
- Wood species
- Douglas fir, Hemlock, Balsam and true firs, White oak, Red oak, Maple, Knotty alder, Red cedar, Yellow cedar, Black walnut
- Finishes
- No paint; Clear coat; UV; Ebony; Walnut; Douglas; White; Black; Custom colour match from an approved sample; Powder-coated aluminum cladding, standard and extreme-duty, anodized and wood-grain options
Ratings by operation
NAFS performance grade for each operation in this line, from the manufacturer's test reports. Confirm the report for your exact size and configuration.
| OperationHow the window opens: casement, awning, hung, sliding, tilt-turn or fixed. The symbols show the hinge side or travel direction. | RatingThe NAFS performance class and grade, e.g. CW-PG70. Shows the loads the window passed in testing. | Tested up toThe largest unit the manufacturer tested at its rating. Bigger units may need engineering or a lower rating. | Max sash weightThe heaviest opening sash or sliding panel the hardware is rated to carry. Limits size with heavy triple glass. |
|---|---|---|---|
| Fixed | CW-PG70 | 60 × 98 in | Not published |
| Fixed | CW-PG55 | 123 × 118 in | Not published |
| Fixed | Engineered per project | 228 × 228 in | Not published |
State and local approvals
Approvals some jurisdictions require on top of national ratings. Check the number and expiration date at submittal.
No state or local approvals on file for this line. Florida, coastal Texas and California fire zones each require their own approval, so confirm with the manufacturer before specifying it there.
Manufacturer warranty
Fenstür Windows & Doors has not published warranty terms for this line. Ask the sales rep for the written warranty with your quote.
- Published condition: The finish warranty on all-wood exteriors requires applying the Fenstür cleaning and maintenance kit once a year.
- Published condition: Fenstür is not responsible for warping or twisting if windows or doors are left open or unlocked during construction.
Manufacturer documents
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- Author
- RFV Editorial
Sources
- Fenstür: Windows, accessed November 2, 2026
- Fenstür: Performance, accessed November 2, 2026
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