TM Bolena: How Windows Are Checked with a Thermal Imager

TM Bolena shows how windows are checked with a thermal imager, giving a clear before-and-after comparison of heat loss. The head of the factory's service centre demonstrates this quality-control method using a thermal survey.

What the video shows

• The thermal imager captures significant heat loss through old timber windows.


• They are replaced with Bolena metal-plastic windows — five-chamber units with energy-saving glass.


• A repeat thermal survey shows no cold (freezing) zones on the screen.

A thermal survey is a clear way to assess the insulation benefit of replacing windows.