This Kodak 4 x 12" #89B Opaque Infrared Wratten Gel Filter is for black and white infrared films, and filters out light below approximately 650nm. It allows pictures of a pure red image, while making good use of the relatively low sensitivity of infrared films.
Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6 (150 x 150mm), 14 x 18" and 4 x 12" (10.2 x 30.5cm).