A model has been developed for the cooling of a quiescent hot layer by a sprinkler spray in a two-layer zone model (with no direct interaction of the spray with a fire plume), based on existing models of spray induced flow and heat transfer to evaporating drops. In addition, existing models have been adapted to predict the penetration of the sprayinduced flow below the layer interface and associated entrainment of lower-layer fluid into the upper layer. The cooling model is in good agreement with published results from sprinklered room fire experiments, for which penetration of sprayinduced flow into the lower layer and associated entrainment were calculated to be negligible. No published results have beend found to test the validity of the adapted models of penetration and associated entrainment, which do not account for possible effects of the spray below the layer interface.