Low U-value kit ZTB lowers the U-value in an installation. There is no visible difference between a sun tunnel with or without the low U-value kit. The same discreet interior design is maintained. It consists of two layers of acrylic glass and a gasket. Only for 35 cm rigid and flexible sun tunnels.
Benefits
Lowers the U-value in a standard installation
Easily fitted – together with or after installation of the sun tunnel
Discreet visual appearance
Installation Guide Asset
Assets: 1
ZTB
LINK
CAD drawing
Assets: 1
CAD Drawing
LINK
CE Marking Asset URL
Assets: 1
https://resources.velux.ie/ce-marking
LINK
Size Chart
Assets: 1
Poster with VELUX roof windows (product size chart) Standard roof windows and Special function roof windows