The steel you can't see inside a uPVC frame is one of the biggest quality differences. Here's why it matters.
Larger uPVC frames carry steel inside the hollow profile to stop them flexing under their own weight and wind load. Without it, big frames bow, sashes drop, and windows stop sealing.
Because it's hidden, reinforcement is where cheap jobs quietly economise — and you only find out when the window droops in a couple of years. Always ask whether larger frames are reinforced.
Related guides covering this topic from other angles — different products, applications, or contexts.
Tell us your openings and we'll measure on site, advise, and give you a real quote — factory-direct from our Pannimadai works in Coimbatore.