Abstract: A roller door assembly has means for tensioning same wherein a load is applied to a bottom edge of the roller and means for counterbalancing the weight of the door wherein a load is applied to the roller, the loads exerted by both said means being dependent on the amount of door off the roller.

Abstract: A roller door assembly comprises a roller door having on its vertical edges spaced restraining members, and guides at each edge of the door including opposing members forming a gap therebetween. The restraining members are on one side of the gap with the door on the other side thereof, whereby upto a desired pressure or force on the door the restraining members cannot pass through said gaps but at said desired pressure or force the restraining members are compressed and/or the gap expends for the restraining members to pass through said gaps to release the door.