Abstract: A shelter providing a closed, isolated and controlled environment for growing plants is formed of an inflated plastic tube having a bed of particulate material on the bottom of the tube and a number of plant containers on the particulate material bed. A combined air return, thermal insulating duct and sun shade for the tube is formed by a thin, flexible shade sheet of decreased light transmissivity having a peripheral edge continuously secured to the periphery of the tube along an area intermediate the top and bottom of the tube. The tube, and the air duct that is formed between the shade sheet and the top of the tube, are inflated by blowing air into one end of the tube, and flowing air from the other end of the tube into the space between the shade sheet and the top of the tube to be returned through the air duct back to the blower. Air in the shelter is conditioned by suitable filters or heating or cooling devices at the blower.

Abstract: A roll of pretaped, laterally folded masking material is mounted on a dispenser which is attached to the legpiece of one of a pair of stilts worn by masking workers. When the stilts are secured to the feet and legs of a worker, the dispenser supports the roll generally vertically alongside the worker's body with the taped end of the roll facing upwardly and positioned approximately at the level of his shoulder. To mask the walls in a room, the worker unrolls the folded material and fastens the tape continuously along the tops of the walls around the perimeter of the room while moving along the walls. The unrolled material is then cut from the roll and the portion below the tape attached to the walls is unfolded downwardly to completely mask the walls. To subsequently mask the floor, the worker attaches the taped edge of another length of the material along one wall to the free edge of the material already taped to that wall.