Limited stock. Amazon has the Air King BFQ50 Snap-In Exhaust Fan (White) on sale for $19 with free shipping on $35+ or with Prime. Dimensions: 10"D x 10"W x 4.75"H.

• 50 CFM, includes 4" plastic duct collar with back draft damper.
• Designed for small spaces, like bathrooms (45 to 65 square feet)