Vertical Slider Windows - uPVC window system by Winkraft (Lucknow, India). WINKRAFT Vertical Slider Windows a traditional fenestration concept that has become the perfect solution for ancillary frames when the opening aperture is taller than width i.e. reference golden ratio 1: 1.618 and when one opening sash is required for ventilation and/or fire escape! Its simple operation is based on a pair of frame specific site tensioned spiral balances that can hold the sash open in any position. The spiral balance technology has successfully replaced the traditional weights and pulley method because of requiring less space enabling the modern uPVC vertical slider to fit perfectly into both aperture types straight through or reveal. Specifications: Balance: Site-tensioned spiral balances; Ratio: Golden ratio 1:1.618. Applications: Ancillary frames, Heritage-style buildings. Finishes: Dark Oak, Golden Oak, Walnut, Mahogany, Rustic Oak, Anthracite Grey, Black Smooth, Flemish Gold, Smooth Grey, Rose Gold, Brush Gold. Profiles: ENCRAFT India - ISO 9001:2015, ISO 14001:2015, TUV Nord certified; Profile guarantee: 10 years; Glazing: 4 mm single to 36 mm triple; Wind load: 3000 Pascal (245 km/hr equivalent); Sound insulation: Up to 40 dB reduction; Thermal performance: 0.8 W/m2K (TwinSash double-glazed unit); Fire safety: uPVC is self-extinguishing.

uPVC Windows/System 04
Vertical Slider Windows
WINKRAFT Vertical Slider Windows a traditional fenestration concept that has become the perfect solution for ancillary frames when the opening aperture is taller than width i.e
- Product
- Vertical Slider Windows
- Type
- uPVC window system
- Profiles
- ENCRAFT India
- Balance
- Site-tensioned spiral balances
- Ratio
- Golden ratio 1:1.618
- Typical applications
- Ancillary frames, Heritage-style buildings
- Finish options
- 11 shades
- Glazing
- 4 mm single to 36 mm triple
About Vertical Slider Windows
WINKRAFT Vertical Slider Windows a traditional fenestration concept that has become the perfect solution for ancillary frames when the opening aperture is taller than width i.e. reference golden ratio 1: 1.618 and when one opening sash is required for ventilation and/or fire escape! Its simple operation is based on a pair of frame specific site tensioned spiral balances that can hold the sash open in any position. The spiral balance technology has successfully replaced the traditional weights and pulley method because of requiring less space enabling the modern uPVC vertical slider to fit perfectly into both aperture types straight through or reveal.
Where it is specified
Vertical Slider Windows are typically used in ancillary frames, heritage-style buildings. Browse by room:
Specifications
Performance
| Balance | Site-tensioned spiral balances |
|---|
Construction
| Ratio | Golden ratio 1:1.618 |
|---|
Range performance
| Glazing | 4 mm single to 36 mm triple |
|---|---|
| Wind load | 3000 Pa (245 km/hr) |
| Sound reduction | Up to 40 dB |
| Thermal | 0.8 W/m²K (TwinSash DGU) |
| Profiles | ENCRAFT India · ISO 9001:2015 |
| Guarantee | 10 years on profile |
Profile section

Finishes
Vertical Slider Windows in nine production shades
- Dark Oak
- Golden Oak
- Walnut
- Mahogany
- Rustic Oak
- Anthracite Grey
- Black Smooth
- Flemish Gold
- Smooth Grey
- Rose Gold
- Brush Gold
Vertical Slider Windows — questions we are asked
What are Vertical Slider Windows?
WINKRAFT Vertical Slider Windows a traditional fenestration concept that has become the perfect solution for ancillary frames when the opening aperture is taller than width i.e.
Where are Vertical Slider Windows typically used?
Vertical Slider Windows are specified for ancillary frames, heritage-style buildings.
What finishes are available for Vertical Slider Windows?
Vertical Slider Windows are available in nine production shades: Dark Oak, Golden Oak, Walnut, Mahogany, Rustic Oak, Anthracite Grey, Black Smooth, Flemish Gold, Smooth Grey, Rose Gold, Brush Gold. Woodgrain, solid and metallic options are all offered.
What glazing can Vertical Slider Windows take?
Glazing runs from 4 mm single to 36 mm triple, in heat, sound and safety configurations. Winkraft systems achieve up to 40 dB sound reduction and a 3000 Pascal wind load rating (equivalent to 245 km/hr).
Who manufactures Vertical Slider Windows?
Vertical Slider Windows are manufactured by Winkraft (Ram Mohan Polypack Pvt. Ltd.) in Lucknow, established 2011. Winkraft manufactures rather than trades, and installs with its own site teams. Profiles are ENCRAFT India, ISO 9001:2015 and ISO 14001:2015 certified, with a 10-year profile guarantee.
Related systems
Often specified alongside

Aluminium Vertical Sliding Windows
Operation: Bottom sash sliding
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Aluminium Vertical Fold & Slide System
Operation: Panels fold and stack at the head of the opening
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uPVC Casement Windows
Profile Depth: 42 / 62 mm
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uPVC Sliding Windows
Fly Screen: Clip-on or integrated
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What most people ask next.
- Aluminium Vertical Sliding WindowsAluminiumComparing uPVC against Aluminium? This is the same mechanism in aluminium.
- All uPVC Windows8 systemsNot sure this is the right system? Compare all 8 in the range side by side.
- Finishes and colours9 shadesNine woodgrain and solid finishes, with the exact shade shown against a white frame.
- Get a price for this systemFreeSend the opening sizes and we return a window schedule with a quotation.
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