Cooker/Oven Hood not Extracting
You will not be surprised to learn that it is very common to find that cooker or oven hoods do not extract cooking smells as expected. Unfortunately, if you have a budget model this is really not unexpected, all looks and no substance! They are not built to be strong enough to actually do what they’re supposed to.
If you have purchased one of these it would be worthwhile to go back to the retailer, as they should have a good explanation of why they even stock these shoddy items. However, as the product sold is not fit for purpose, you should be entitled to a full refund, or an upgraded product.
Testing your cooker hood
Note, not to be tested whilst cooking is in progress.Use a small piece of fairly light paper, switch on the extractor hood, and hold the piece of paper to the mesh area and if it stays in place when you let go, your extractor is actually working. Read More Here