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Product Description
7.5" Radius (15" Diameter opening) Climax Fire Door Frame in 2 1/2" Scale 2% oversize to allow a 2% shrinkage allowance in Steel. Scaled at 1 : 5 to create nominal 3" diameter opening in the backhead to match the 7.5" Radius (15" Diameter) of the original on a 1922 16.7 H.P. Union Iron Works Boiler for a A-12 or A-15 Climax.
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