This system is an evolution of the Practic Hidden Sash 70 RPT (HT70) and, just like its older sibling, it features the same visible frame surface dimensions—just 58.8 mm, giving the system a distinctly minimalist character and, therefore, offering a larger glazed area. These reduced dimensions enhance the intrinsic aesthetic appeal of a hidden sash system, which becomes even more prominent in the HT60. For this reason, this window type is a favorite among architects and interior designers.
Thermal break is achieved using 24 mm polyamides in the frame and a plastic coextruded glazing bead in the sash. These materials deliver frame thermal transmittance levels similar to those of a classic cut-out casement such as the Practic 45. However, unlike that series, the glass surface area is larger, meaning that the overall thermal performanceof the window is improved and suitable for nearly all climate zones as defined by the Spanish Building Code (CTE).
The closure system uses three gaskets, ensuring excellent sealing. This is a versatile, minimalist system, thermally suitable for most climate zones, and offering top-level performance.
The Practic Hidden Sash 60 RPT ensures an optimal price–performance ratio.
European groove casement system with thermal break (RPT).
Laboratory performance results:
According to the CTE (Código Técnico de la Edificación), which sets minimum thermal performance requirements based on geographic location, this system is compliant. Furthermore, the increased glazed surface due to the slim profile sections allows for even better thermal coefficients when using high-performance glazing.
The frame profiles feature a clip-on system, allowing easy installation of auxiliary profiles such as trim covers, drip caps, or frame connectors.
Innaltech supplies the full range of accessories for this system. All our systems are digitally integrated, with features for material breakdowns, cutting optimization, manufacturing sheets, and CE marking labels. Additionally, automated cutting and machining is supported through CNC centers. The software is available in Spanish, Catalan, and French.
| Window | Air | Water | Wind |
| 820 x 2100 mm – 1 leaf tilt-and-turn with 4/16/4 glass | 4 | 9A | C5 |
| 1235 x 1470 mm – 2 leaf tilt-and-turn with 4/16/4 glass | 4 | 9A | C1 |
Acoustic Performance Tests
| Window | Test Reporto | Result (dB) |
| 1400 x 1500 mm – 2 leaf tilt-and-turn with 4/16/4 glass | Internal | 34 |
| 1400 x 1500 mm – 2 leaf tilt-and-turn with 3+3/16/6 glass | Internal | 37 |
Frame Thermal Performance
| Frame part | Test Report | Result (W/m2K) |
| Perimeter joint | Internal | 3,7 |
| Central joint | Internal | 3,7 |
Window Thermal Performance According to CTE
| Window | Result (W/m2K) 4/14/4 (Ug=2,8) |
Result (W/m2K) 4/14/4 BE* (Ug=1,5) |
Result (W/m2K) 4/16 Ar/4 BE** (Ug = 1,1) |
|
| 1 leaf – 820 x 2100 mm | 2,99 | 1,97 | 1,66 | |
| 2 leaves – 1400 x 1500 mm | 3,00 | 2,00 | 1,69 | |
| 2 leaves – 1600 x 2100 mm | 2,97 | 1,91 | 1,59 | |
| * Low-E: Low-emissivity glazing ** Thermal performance results obtained using Foam Isolation System in both sash and frame. |
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Air permeability and watertightness tests covered
Air permeability, watertightness, and wind load resistance tests covered
Measures not recommended
Measures not feasible* Maximum recommended weight with the most unfavorable tilt-and-turn hardware
