Best Bathroom Exhaust Fans for 3-Inch Ducts. Smaller, 3-inch ducts simply can’t conduct as much air as quickly as larger, 4-inch ones. But that doesn’t mean these fans aren’t effective ...

The stones cause no symptoms as they form, but if they reach a size that blocks the duct, saliva backs up into the gland, causing pain and swelling. You may feel the pain off and on, and it may ...