Abstract: The invention relates to a frame for supporting a glass sheet in horizontal position during tempering. The frame is formed by a body and includes bearing members with bearing surfaces which support the glass sheet and which between them delimit channels for evacuation of blowing gases. The bearing members are located in at least a selected region of the body.

Abstract: A cooling apparatus for a float-glass installation formed by a pair of pipes providing a path of circulation for a refrigerant adapted to extend through a sidewall of the installation to extend at least partially across a transverse dimension of a ribbon of glass moving along a path, as supported by a molten bath. Insulation means surrounds the pipes along a length from the point of entry to a transition point defining an insulated length and a non-insulated length of pipes. The insulation means and the pipes are movable relative to one another to relocate the transition point as determined by the dimension of the ribbon of glass to be produced.