37" (940 mm) in Length Storm Door Bottom Sweep Helps Prevent Air Infiltration Used as Bottom Seal On Storm Doors Easy To Install 37" Length x 3/8" Height x 1/8" Top Width, V -Shape Gray Vinyl, Storm Door Bottom Sweep, Used As Bottom Seal On Storm Doors, Helps Prevent Air Infiltration. From the Manufacturer This storm door bottom sweep is constructed from gray vinyl. It is used as a bottom seal on storm doors. This type of bottom sweep helps prevent air infiltration.