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 ...

As a category, these fans perform better in terms of airflow than fans built to fit a 3-inch duct. These models do a good job of evacuating air through the duct while keeping noise low. Best ...

3 Inch Flexible Duct Hose 16 Feet Non-Insulated Aluminum Dryer Vent Hose Noise Reducer PVC Air Hose for HVAC Ventilation, Inline Duct Fan, Black (2 Clamps Included) ...