Replace Expensive Transformer with cheaper alternative?
Any time you replace a safety-critical component, the onus is on you to ensure that you're not violating any regulations or local laws.



Based on your link, the transformer that failed has a big backwards UR mark on it, which means its an Underwriters Laboratories recognized component. Most likely the safety certification of the entire hood relies on this one piece of equipment.

If you improvise something, or try to fix it yourself, or replace it with a 'cheaper' alternative, beware: if something goes wrong you're responsible and most likely wouldn't get any insurance money for it either. My advice: replace it with the same part or get a new hood.

For what it's worth, the features listed on the label: thermal protection, short circuit protection and your picture make it clear that it's more than just an AC transformer in there. I see a bridge rectifier, some capacitors, possibly a sleeved inductor along with the transformer. There's probably some housekeeping going on in there along with the step-down functionality.