Sash, mullion, beading, gasket, reinforcement — the words suppliers use, explained plainly so you can follow a quote.
Understanding a few terms lets you read a quote and ask the right questions — especially about reinforcement, which is often where corners get cut invisibly.
The parts you can't see — reinforcement and gaskets — matter most for how a window lasts. A supplier who explains them plainly is one worth trusting.
Related guides covering this topic from other angles — different products, applications, or contexts.
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