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The external louvre, type W-331, is designed for wall application, for supply and exhaust of small air volumes
in heating, ventilating or
The article codes for the Grada external louver W-331 have changed.
- What was W-331 earlier, now is W-332 (new)
- What was W-333 earlier, now is W-331
- W-334 is now obsolete
- W-330 remains unchanged
You can find the new datasheet on the product page and see the changes yourself in at "how to order"