Square Weather Louvre - 900mm x 900mm Alpha Air

Square Weather Louvre – 900mm x 900mm

External weather louvre for ventilation openings. Square Weather Louvre allows airflow while protecting against rain and debris ingress. Durable construction for long-term outdoor exposure. Ideal for plant rooms and facade ventilation.

£220.55

20% VAT added at checkout

In Stock – Available for next day delivery

Order before 3pm today for delivery by Monday 14th September

Select Size

Neck Size

Powder Coating Colour (Optional)

Enter your preferred RAL colour code for powder coating. Leave blank for natural/unpainted finish.
Note: £60 per unique colour across your order.

Powder coating adds 1–2 working days to the lead time. It also makes this product made-to-order and non-returnable per our Returns Policy. This does not affect your rights if an item is faulty or not as described.

RAL Code

Description

Expertly designed for optimal performance, our Square Weather Louvre features a durable and lightweight aluminium construction. This classic design seamlessly balances weather protection and ventilation, making it the ideal choice for the external outlet to your ductwork system.

Easily connect this to circular ducting or flex with our Plenum Box!

Also available are our Circular Weather Louvres

Please note that the size selected will be the NECK size of the louvre. The overall face size will be 50mm larger on both axes.

We can make any size to order! Please contact us for a quote.

Frequently Asked Questions

Is the size I select the overall size of the louvre?

No — the size selected is the neck size, which should match the duct or wall opening it serves. The overall face size is 50mm larger on both axes, so a 300mm x 300mm louvre has a 350mm x 350mm face. Allow for that flange overlap when positioning the louvre on the wall.

What are the louvres made from?

Durable, lightweight aluminium. The angled blade design balances weather protection with ventilation, keeping rain out while letting air through, which makes these louvres the standard choice for the external inlet or outlet of a ducted ventilation system. Circular versions are also aluminium, made to suit round duct sizes directly.

What sizes are available?

Square louvres are stocked from 150mm x 150mm up to 1000mm x 1000mm in 50mm steps, and circular louvres from 100mm to 315mm diameter. Rectangular louvres are made to order to your dimensions — up to 1800mm wide and 2400mm high online — and we can quote for any size beyond that if you contact us.

How do I connect a square louvre to round ducting?

Use a grille box, also called a plenum box, behind the louvre. The box presents a square face that matches the louvre neck and a circular spigot that connects to your spiral or flexible ducting. Match the first two dimensions of the plenum box to the louvre neck size and the third to your duct diameter.

How quickly can I get a weather louvre?

Stock square and circular sizes carry our fastest lead time, shown on each product page. Custom-size rectangular louvres are manufactured to order, so allow the longer lead time stated on that product. Orders over £400 excluding VAT qualify for free delivery.

Delivery Information

In Stock

Next Day Delivery — order before 3pm Monday to Friday for dispatch the same day.

Delivery Options

Service	Estimated Delivery	Cost
Standard Delivery (UK mainland)	Next working day from dispatch	£15.95 +VAT (£7.95 for small items)
Free Delivery	Next working day from dispatch	Free on orders over £400 ex VAT
Click & Collect	Collect from our Leicester branch	Free
Scottish Highlands & Islands	2-3 working days from dispatch	£36.95 +VAT

Delivery Area

We deliver to all UK mainland addresses. Scottish Highlands and Islands deliveries may take a little longer. We are not currently delivering to Northern Ireland — Click & Collect remains available.

Questions about delivery? Call us on 0116 246 0031 or email sales@alphaair.co.uk

Returns Policy

Six-Week Returns — No Restocking Fees

We want you to buy with confidence. You can return any standard stocked item within six weeks (42 days) of delivery for a full refund — 100% of the item price, no restocking or handling fees. Trade and business customers get exactly the same rights as retail customers. See our Returns Policy for full details.

Return Conditions

Items must be unused and in original packaging
Custom-made, bespoke or powder-coated items are made to your specification and cannot be returned unless faulty
Items must be returned with proof of purchase
Return shipping costs are the responsibility of the customer unless the item is faulty

How to Return

Contact our customer service team to arrange a return
Pack the item securely in its original packaging
Include your order number and reason for return
Ship the item to our returns address

Faulty Items

If you receive a faulty or damaged item, please let us know as soon as possible — ideally within 48 hours of delivery, so we can claim against the courier on your behalf. We will arrange a free collection and send a replacement or issue a full refund. This does not affect your statutory rights.

Questions? Contact us at sales@alphaair.co.uk

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