A fire collar comprising: a casing defining a service conduit passage therethrough, the casing having an activation side and an installation side, wherein the casing defines an activation side located activation chamber; and an opposing pair of shutters located within the activation chamber defining operative leading edges such that, in use: the shutters are configurable in a non-activated configuration wherein the leading edges are spaced apart so as to make allowance for the service conduit therebetween; and when the fire collar is exposed to heat on the activation side in use, the shutters transition to an activated configuration wherein the respective leading edges of the shutters close in to close the passage, wherein: the shutters are pivotally coupled to the casing at pivot points and wherein the shutters are orientated with the pivot points towards the installation side and the leading edges towards the activation side; the shutters are biased together; the activation chamber defines an open ended entrance providing spacing around the periphery of a service conduit located within the activation chamber between the leading edges of the shutters in use such that, when the fire collar is exposed to heat on the activation side in use, a substantial portion of the periphery of the service conduit located within the activation chamber between the leading edges of the shutters is exposed to the heat such that the service conduit softens and is crimped by the leading edges of the shutters; characterised in that the opposing shutters are biased together using a tension spring. a casing defining a service conduit passage therethrough, the casing having an activation side and an installation side, wherein the casing defines an activation side located activation chamber; and an opposing pair of shutters located within the activation chamber defining operative leading edges such that, in use: the shutters are configurable in a non-activated configuration wherein the leading edges are spaced apart so as to make allowance for the service conduit therebetween; and when the fire collar is exposed to heat on the activation side in use, the shutters transition to an activated configuration wherein the respective leading edges of the shutters close in to close the passage, wherein: the shutters are pivotally coupled to the casing at pivot points and wherein the shutters are orientated with the pivot points towards the installation side and the leading edges towards the activation side; the shutters are biased together; the activation chamber defines an open ended entrance providing spacing around the periphery of a service conduit located within the activation chamber between the leading edges of the shutters in use such that, when the fire collar is exposed to heat on the activation side in use, a substantial portion of the periphery of the service conduit located within the activation chamber between the leading edges of the shutters is exposed to the heat such that the service conduit softens and is crimped by the leading edges of the shutters; characterised in that the opposing shutters are biased together using a tension spring. the shutters are configurable in a non-activated configuration wherein the leading edges are spaced apart so as to make allowance for the service conduit therebetween; and when the fire collar is exposed to heat on the activation side in use, the shutters transition to an activated configuration wherein the respective leading edges of the shutters close in to close the passage, wherein: the shutters are pivotally coupled to the casing at pivot points and wherein the shutters are orientated with the pivot points towards the installation side and the leading edges towards the activation side; the shutters are biased together; the activation chamber defines an open ended entrance providing spacing around the periphery of a service conduit located within the activation chamber between the leading edges of the shutters in use such that, when the fire collar is exposed to heat on the activation side in use, a substantial portion of the periphery of the service conduit located within the activation chamber between the leading edges of the shutters is exposed to the heat such that the service conduit softens and is crimped by the leading edges of the shutters; characterised in that the opposing shutters are biased together using a tension spring. the shutters are pivotally coupled to the casing at pivot points and wherein the shutters are orientated with the pivot points towards the installation side and the leading edges towards the activation side; the shutters are biased together; the activation chamber defines an open ended entrance providing spacing around the periphery of a service conduit located within the activation chamber between the leading edges of the shutters in use such that, when the fire collar is exposed to heat on the activation side in use, a substantial portion of the periphery of the service conduit located within the activation chamber between the leading edges of the shutters is exposed to the heat such that the service conduit softens and is crimped by the leading edges of the shutters; characterised in that the opposing shutters are biased together using a tension spring.