The Da-Lite 36786 is a Fast-Fold Skirt for Deluxe, Heavy Duty Deluxe and Truss screens. For use with HDTV screen formats and for screen size 12'3" x 21'. The 36786 is box pleated and attaches with snaps to Fast-Fold screens to give a finished aesthetic. Standard skirt height is 45?. The Ultra Velour material is inherently flame retardant and Da-Lite Ultra Velour can be washed in any standard washing machine and will continue to be flame retardant while the cotton velour will lose its ability to be flame retardant with a number of dry cleanings. Da-Lite Ultra Velour is sound neutral with a high opacity. If you love going to the movies then Da-Lite has all the components to make your space look like the real thing. Just add popcorn!