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How to choose a heat rejection film: four questions to ask
Four questions decide the right grade: light, heat, glass side and glass type.
1. How much light do you want to keep?
Visible light transmittance decides brightness. Offices usually stay above 50%; west-facing rooms can go darker.
2. How much heat must be rejected?
Ask for TSER per EN 410 — the whole solar spectrum is what heats the room, not just brightness.
3. Interior or exterior glass?
Exterior grades reject heat before it enters; interior grades are easier to maintain.
4. What is the glass type?
Double-glazed, Low-E and laminated units each need a compatible grade — we match the film to the glass in the quotation.
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