All TecLite heads require lintels.
All one piece heads over 2000mm in length should be supported by a heavy duty lintel.
HY02 & HY03: Non-standard sizes to be factory cut from nextsize up.
HY04:  Non-standard sizes to be factory cut from two standard heads.

See Data sheet TLFIX01 for fixing guidance
See Data sheet TLCUT01 for cutting guidance