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Hinkley, P.L., 1960. ROOF VENTING OF BURNING ENCLOSURES PART IIIA NOMOGRAMS APPLICABLE TO THE VENTING OF FIRES OF CONSTANT HEAT OUTPUT. Fire Research Notes 443
Equations given in a previous report in this series(1) can be used to calculate the depth and temperature of the layer of hot gases beneath the ceiling and the rate of discharge of heat through the vent. In this report nomograms of these equations are given for determining these quantities and also the area of roof vent required to ensure that all low level openings in an enclosure full of hot gas are inlets for cold air.