Can a vent hood catch on fire?

Yes, vent hoods get coated and sometimes clogged with grease – and that's a fire hazard. It's important to periodically check and clean and replace as needed. If your hood vents (rather than just circulates), you need to regularly check the vent that leads from the vent hood to the outside to make sure there is no grease buildup inside of it. If there is, contact a vent-cleaning or heating and cooling professional to clean the vent properly.