Egg crate grilles have an open lattice core that gives around 90% free area, so extract and return air passes through with very little resistance or noise. Ours are extruded aluminium with a white paint finish, for ceiling or wall mounting, in nine neck sizes from 150mm to 550mm, with or without an opposed blade damper on the back. The 550mm neck has a 595mm overall flange and drops into a standard 600 x 600 ceiling grid. For sizing help or a non-standard size, email hello@efans.co.uk or call 0161 399 3825.
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Frequently asked questions
What is an egg crate grille used for?
Extract and return air. The open lattice, with vanes parallel to the airflow, gives a free area of around 90%, so the grille adds very little resistance. That makes it a good choice wherever a lot of air has to be drawn out of a room quietly: offices, shops, server rooms, plant rooms and suspended ceilings.
What sizes are available?
Nine neck sizes: 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm and 550mm square. The neck is the duct or opening size. The outside flange is 45mm larger, so a 550mm neck grille is 595mm overall and replaces a tile in a 600 x 600 lay-in ceiling grid.
Do egg crate grilles come with a damper?
Each size is available with or without an opposed blade damper on the back. The damper lets you trim the airflow at the grille during commissioning, which is worth having wherever several grilles share one duct system so each room gets its design rate.
Can I use an egg crate grille for supply air?
It will pass the air, but it has no adjustable blades, so you cannot control the direction or throw. For supply air into occupied rooms, a ceiling diffuser or a deflection grille gives better comfort.
Egg crate or return air grille?
An egg crate grille is a type of return air grille. The square lattice gives a higher free area than a grille with parallel fixed blades, so it is the usual choice when airflow and low noise matter more than appearance.
Can egg crate grilles be used as transfer grilles?
Yes, in an internal wall or door the lattice lets air pass between rooms while breaking up the line of sight. They are not fire rated, so for a fire door or fire resisting wall use an intumescent fire block or the appropriate fire damper.
