  
SF4: The new SF4 is designed for tight fitting places. The low profile, crossflow design is extremely efficient. Measures 5.75 inches long x 1.75 inches deep x 1.75 inches high, 43 cubic feet per minute.
SF3N: The SF3N features improved mounting tabs and a low profile, crossflow design. Measures 8.125 inches long x 1.75 inches deep x 1.75 inches high, 54 cubic feet per minute.
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