We are planning to paint our kitchen and thought it might be a good idea to replace our range hood. We have no problem with it, but it's over 20 years old. And we thought we should have the ductwork cleaned out before the new thing is installed.

The duct goes straight up for a distance, makes a slight turn in the attic, and then makes a 90 degree turn at the opening in the attic where the exhaust fan motor blows the stuff to the outside. We have never had the ductwork cleaned and don't know if it's necessary. We are a little concerned that if there's grease in the duct, it could pose a fire hazard.

Any comment from someone with experience in this issue would be appreciated.

Thanks.