Square weather louvres give weatherproof ventilation to a square wall opening for supply or extract air. Ours are aluminium in a natural finish, 38mm deep, with 45 degree fixed blades, a 50% free area and a bird mesh fitted as standard, in ten sizes from 150mm to 600mm. For a non-standard size or a colour finish we offer a made-to-order service. For help choosing, email hello@efans.co.uk or call 0161 399 3825.
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Frequently asked questions
What is a square weather louvre used for?
Finishing a square or rectangular wall opening that carries ventilation, for example plant room intake and exhaust, commercial extract, stores, garages and builder's openings. The 45 degree blades deflect driving rain while the bird mesh keeps birds and debris out.
What sizes do you stock?
Ten square sizes from 150mm to 600mm in 50mm steps: 150, 200, 250, 300, 350, 400, 450, 500, 550 and 600mm. All are 38mm deep. For other sizes, rectangular openings or a painted finish, use our made-to-order service.
What is the free area?
50%. Half of the louvre face is open to airflow and the rest is blade, frame and mesh. When sizing from an airflow figure, allow for this, and go up a size if the air speed through the louvre would be high.
Square or circular weather louvre?
Use a square louvre for a square or rectangular opening, and a circular weather louvre where a single round duct ends at the wall, such as a bathroom fan or MVHR intake.
Are they suitable for supply and extract?
Yes, the same louvre works on intake or exhaust. On an exposed supply intake, keep the air speed through the louvre low so rain is not drawn through the blades.
Can I use a weather louvre on a fire-rated wall?
The louvre is a weather finish only and has no fire rating. Where the duct passes through a fire compartment wall you need a fire damper in the duct behind it.
