Inner Core Construction:
Steel-Stiffened Core - 20 gauge vertical steel stiffeners at 6'' centres. Fibreglass insulation provides excellent sound-deadening. Door edges can be tack-welded, filled and ground smooth.
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Inner Core Construction:
Polystyrene Core - 1-3/4'' polystyrene composite construction. All reinforcing boxes contain polystyrene. R factor: 7.0. STC 26 in 20 gauge material.
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Inner Core Construction:
Temperature-Rise Core - Solid Mineral-fibre core slab provides maximum protection up to 250 degrees Celsius. Exceeds current NFPA-80 recommendations. Ideal for stairwells and installations adjacent to fire-walls.
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