Why Tilt and Turn?
All OKNOPLAST windows feature Tilt and Turn operation with multi-point locking that engages 3-5 compression points simultaneously around the sash perimeter:
Locked — Full perimeter compression against EPDM gasket for maximum airtightness
Tilt — Opens from the top (4-6 inches) for ventilation while maintaining security
Turn — Swings fully inward for easy cleaning and emergency egress
This achieves air infiltration below 0.10 CFM/ft² at 25 Pa — compared to 0.30-0.50 CFM/ft² for most double-hung replacements.
Certifications and Guarantees
HVHZ (High Velocity Hurricane Zone)
Our windows are rigorously tested and certified for hurricane resistance in the HVHZ, offering the highest level of protection against extreme weather conditions, especially in Zone 4 wind zones. This certification demonstrates our commitment to safety and durability, providing peace of mind for customers in hurricane-prone areas like Florida.
ISO 14001
OKNOPLAST proudly holds the international ISO 14001 certification, demonstrating our commitment to sustainable development and environmental protection. This certification validates our efforts to minimize environmental impact, making OKNOPLAST a leader in eco-friendly practices.
NFRC (National Fenestration Rating Council)
With NFRC certification, our windows undergo comprehensive testing to determine their thermal performance, ensuring they meet or exceed industry standards for energy efficiency. This certification empowers customers to make informed decisions about their window investments, choosing products that prioritize comfort and sustainability.
PHIUS (Passive House Institute US)
Our PHIUS-certified windows are meticulously designed and tested to meet the energy efficiency requirements of Passive House construction. This demonstrates our dedication to sustainability and innovation, providing customers with windows that not only conserve energy but also contribute to healthier and more comfortable living environments.
Also certified: IFT Quality Mark (ID 190-6038531-8) · CEKAL insulating glass units · EN 12608 Class A uPVC compound · 10-year product guarantee.
Lead time: 8-10 weeks from confirmed order to U.S. delivery. 4-5 weeks production at the facility in Poland and 4-5 weeks ocean freight and customs clearance.
