What if Haier range hood can't blow the check valve?

You can try to open the check valve by hand first. If it can be opened gently, it means it is not a check valve. If a large force is required, it means that the check valve shaft is not well matched and the resistance is too great. Add some oil and try again, or let the property manager fix it. Check the hood for problems. You can take it off and put it on the ground to try it on. The wind power of normal range hood is very obvious.