4mm Low-E Float / 4mm Krypton cavity / 4mm Activ Toughened
Request made-to-measure heritage double glazing combining 4mm Low-E Float on the inside, a 4mm Krypton gas cavity and 4mm Activ Toughened as Panel 2. This separate 12mm nominal sealed-unit make-up is available to discuss with a specialist supplier.
Exploded Sealed Unit Architecture
Activ toughened glass for heritage glazing
Request a heritage sealed unit with a 4mm Activ toughened second pane. Include the window position and any safety-glazing requirements so the supplier can confirm the specified Activ glass, toughened treatment and complete unit construction for your project.
For this 4mm Activ Toughened product, the selected 4mm cavity and Krypton gas give an indicative U-value baseline of 1.9 W/m²K. Panel 1 is 4mm Low-E Float; Panel 2 is 4mm Activ Toughened. The total nominal unit thickness is 12mm. Confirm your rebate depth, sightline, spacer colour and the declared thermal performance with the supplier before ordering.
Choosing 4mm Activ Toughened for heritage double glazing does not establish planning or conservation permission. Your supplier should confirm the exact product, and any required appearance match or project approval must be checked separately.