I made this in High School. It was designed to cover the outdoor picnic area so we seniors could eat outside in inclement weather. It was supported by a small floor fan and was about 24’L x 12’W x 10’H. It was made out of several drop cloths and duct tape. It was held down at school with backpacks. Entry was through a vertical slit in the other end. Here is a picture of it at home.