FOUR GENERATIONS OF WINDOW FRAMES

Wood (est. AD 100) Advantages: Solid and uses natural materials Disadvantages: Expensive and requires lots of maintenance Aluminum (est. 1926) Advantages: Lightweight and strong Disadvantages: Not energyefficient and expensive

PVC (est. 1952) Advantages: Energyefficient, affordable and no maintenance

Disadvantages: Not strong and larger frame needed, meaning less glass

RevoCell with mPVC (est. 2017)

Advantages: Energy efficient, affordable, no maintenance, strong and more space for glass Source: Verdunwindows.com