The Panasonic FV-10VSB1 Contractor Pack of Four Bathroom Fan Motor and Grill is a perfect choice for jobs that require multiple ventilation fans. The WhisperValue bathroom fans are great for remodeling projects and manufactured structured homes as well. The Panasonic FV-10VSB1 four pack of WhisperValue bathroom fans features a round compatible oval duct and this great ventilation fan can be easily installed into 2 x 4 construction. The oval shaped duct also allows the bathroom fan to maintain a higher CFM level. This amazing ventilation fan is also super slim (3-3 4 depth) which allows it to be easily install and requires a much smaller ceiling cavity. The fan is a tapered Sirocco fan that delivers ultimate ventilation and a lower sone level. This great bathroom fan has a noise rating of 1.5 sones. This contractor pack is a four pack of Panasonic FV-10VS1 WhisperValue Ventilation Fans and this low-profile model is also Energy Star qualified.Technology that boosts performance Super low profile housing design Easy installation Energy star qualified for energy savingsAir Volume: 100 CFM 0.1 Staqtic Pressure 90 CFM 0.25 Static Pressure Blower Wheel Type: Sirocco California Title 24 Compliant: Yes Current (Amps): 0.30 Depth: 16-3 4 Duct Diameter (inches): 4 Oval Energy Efficiency (CFM Watt): 2.9 100 CFM 2.7 90 CFM Energy Star Qualified: Yes Grille Size (inches sq.): 13 Height: 7-1 2 Motor Type: Condenser Mounting Opening (inches sq.): 10-7 8 Noise (Sones): 1.5 Sones 100 CFM Power Consumption (Watts): 36.4 100 CFM 36.1 90 CFM Power Rating (V Hz): 120 60 Speed RPM: 840 100 CFM 979 90 CFM Thermal Fuse Protection: Yes Type of Motor Bearing: Ball UL Listed for Tub Shower Enclosure: Yes Washington State VIAQ Code: Yes Width: 14-3 8