Help! Weird size vent cowl

Joined
12 Aug 2021
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United Kingdom
Hi all, first time poster so apologies if in wrong thread.
I have a very odd size external vent from my cooker hood, 13” high by 12” wide. The cowl for it is old and rusty and in desperate need of replacement.

The problem is I cannot seem to find anything remotely large enough anywhere. Largest I have seen is 12x12. Any suggestions as to where I can source something big enough?

Thanks in advance
 
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