4YourHome Exhaust HEPA Filter for Hoover WindTunnel Air Models UH70400 & UH70405 303902001 4YourHome Exhaust HEPA Filter For Hoover WindTunnel Air Models UH70400 & UH70405 303902001 Firs the following models - UH70400 & UH70405 Type - Primary Filter Alternative to genuine part number - 303902001 Please note this part is a non genuine compatible spare part and the manufacturers names and part numbers have been used for reference purposes only