From the Manufacturer
What makes the Air King high performance bath fan series unique is the UL listed molded high impact plastic housing that provides multiple benefits. "Traditional" bath fan housings are fabricated from steel which involves bending and welding. This is a more expensive process and over the life of the fan welds can break, causing the fan to operate much louder or even with a rattling sound. Metal housings reverberate and echo noise. Because the Air King high performance bath fan is in an all plastic housing, there are no welds to break and the plastic is a natural sound absorbent material. If you live anywhere near salt water, or the unit will be used in high moisture areas, this fan is an almost must. The UL listed molded high impact plastic housing will not rust, giving the unit a longer life. The high performance exhaust fan series features a unique snap-in installation system. The included bracket nails or screws to the ceiling joist allowing the fan housing to "snap-in". This is so simple you can even replace an existing fan without having to rip out large sections of ceiling or climbing into the attic. Connect the wiring and the ducting, install the easy fitting grill and you are done. A bath fan installation can now be done in minutes instead of hours. The motors are suitable for continuous operation. The 4-inch plastic duct collar with back draft damper insures quiet operation and prevents drafts from entering the room. UL listed for use over a tub or shower when installed in a GFCI protected branch circuit. This unit features a 90-CFM blower at 2.5-sone which makes for quiet operation. Exhaust capacity for rooms of approximately 90-square-feet. Housing size: 9-1/16-inch wide-by-8-1/2-inch deep-by-4-3/4-inch high.
Product Features: ASHRAE 62.2 Approved Made in USA UL Listed Energy Star Title 24 Compliant Easily Installs Using the Included Snap-In Mounting System UL Listed for Installation Over a Tub or Shower on a GFCI Circuit Plastic damper protects against back drafts and ensures very quiet operation Effective Ventilation For: Bathrooms Up to 85-100 sq. ft. Energy Star Compliant Available in Contractor Packs (4 housing and 4 mbgs) Product Specifications: 4" Round Duct CFM: 90 Sones: 2.5 Duct Size - 4" Round Housing Depth - 4.75 Housing Height - 4.75 Housing Length - 8.5 Housing Width - 9.0625 Product Overview: The High Performance Exhaust Fan Series features an unique Snap-In Installation System. The included bracket nails or screws to the ceiling joist allowing the fan housing to “Snap-In”. Connect the wiring and the ducting, install the easy fitting grill and you are done. A bath fan installation can now be done in minutes. The durable high impact plastic housing ensures quiet. About Air King: Over the forty years Air King has been in business, they have developed something of a reputation for manufacturing quality ventilation products, offering products at a good value, and providing excellent service for their products. Air King believes that a home is more than just a house, it is a sanctuary from the busy world, so shouldn't it be comfortable as well? Their mission is to make homes healthier, more comfortable, and more convenient, and they have delivered for over 40-years.