Barrier B75 Doors system is based on the trusted Aluplast Ideal 4000 PVC profile, a widely used European window and door solution known for its balanced performance, versatility, and reliability. Originally designed with a 70 mm (approx. 2.76 in) construction depth, Ideal 4000 delivers excellent thermal insulation, solid static performance, and value-oriented engineering, making it ideal for residential projects, renovations, and everyday installations where comfort and cost-effectiveness matter. The system features a multi-chamber design with durable steel reinforcement, ensuring structural rigidity and improved stability over time. Its classic PVC profile supports a range of glazing options, including insulated double and certain triple configurations up to ~41–48 mm (≈1.61–1.89 in), allowing users to tailor performance to project needs.