With a free area of 90%, Egg Crate Grilles have long been the industry standard extract grille. Their high free area able to handle huge air volumes with minimal pressure drops and noise generation.
A grille box (a.k.a. plenum box) will be required to connect this grille to circular ductwork
Duct size (mm) 100
Egg Crate Core is made from thin aluminium strips arranged into a lattice.
The square holes in the core are sized 12.5mm x 12.5mm, resulting in a free area of over 90%.
This core is held within an extruded aluminium frame