Duct Size 4 in.

80 CFM, 21.2 Watts, 3.8 CFM/Watt, 1.0 sone, Housing Depth 3-3/8"

100 CFM, 29.6 Watts, 3.4 CFM/Watt, 1.4 sones, Housing Depth 3-3/8"

* This item has been discontinued. Please refer to the link below for the replacement suggested by the supplier

https://www.bulbspro.com/fv0510vs1.html

80 CFM, 22.5 Watt, 3.6 CFM/Watt, 1.0 sone, Housing Depth 3-3/8", 2 x 18 Watt 3500K Compact Fluorescent Lamps included

Please note that the new model number, FV-0510VSL1

Panasonic FV0510VSL1 - WhisperValue DC LED with Pick‐A‐Flow Speed Selector (50‐80‐100 CFM) (bulbspro.com)

100 CFM, 30.2 Watts, 3.3 CFM/Watt, 1.4 sones, Housing Depth 3-3/8", 2 x 18 Watt 3500K Compact Fluorescent Lamps included