The throated lintel helps create a venturi effect, increasing the speed of flue gases as they rise through the chimney. It is advisable to use a throated lintel in any installation where a traditional arched insert is not present. a structural lintel should be installed above the throated lintel to provide additional structural support. Widths36″ (91.4cm)42″ (106.6cm)48″ (122cm)53" (134.6cm)Depth4″ (10cm)Height6″ (15cm)Choose your pack sizeAvailable individually or in packs of 4 or 8. Each pack contains lintels of the same selected width. Single: one lintel. Pack of 4: save 10% against buying four individually. Pack of 8: save 25% against buying eight individually. Select your width and pack size above. The displayed price is for the complete selected pack. A quantity of 1 orders one single lintel or one complete pack, according to your selection.