This includes a defibrillator, Entonox and patient monitoring equipment. As of October 2016, all appliances and front line crews had received the IEC training and equipment. HFRS provides fire cover according to a system of four risk categories which have traditionally been used across the UK, where every building is rated for its risk on a scale from "A" down to "D". The risk category determines the minimum number of appliances to be sent in a pre-determined mobilisation. Category "A" includes areas with a high density of large buildings and/or population, such as offices or factories. Three fire engines are to arrive at "A" risks within eight minutes, the first two within five minutes. Areas with a medium density of large buildings and/or population, such as multi-storey residential blocks, will generally be classified "B" risk. Two fire engines will be deployed, with one to arrive within five minutes and the second within eight minutes. Category "C" covers lower density, suburban areas and detached properties. One fire engine should arrive at a "C" risk incident within ten minutes. More rural areas not covered by the first three categories will be considered "D" risk. One fire engine should arrive at "D" risks within 20 minutes  HFRS also has fire cover for the ports of Southampton and Portsmouth, including HMNB Portsmouth. and the airports of Southampton and Farnbrough. The Fire and Rescue Services Act 2004 gives the UK fire services the ability to call upon other services or fire authorities in what is known as mutual assistance. Hampshire Fire and Rescue gives mutual aid to the following services:   HFRS also mobilises to support airport firefighters at Southampton Airport and Farnbrough Airport. HFRS have their own control, stationed in the HQ, they mobilise appliances for Hampshire and Isle of wight. The service uses Networked Fire Services Partnership, so if need be, in spate conditions, mobilise on behalf of Dorset & Wiltshire and Devon & Somerset FRS, and vice versa. In 2015, Hampshire Fire and Rescue Service carried out a risk review to determine how to reduce costs to match a £16m funding gap that would develop by 2020 due to funding cuts. Following a public consultation in late 2015, the final proposals confirmed that none of the 51 fire stations in Hampshire would close and there would be no compulsory redundancies. Costs would be saved by reducing the number of operational firefighters at stations, including allowing some engines to respond to minor incidents with a smaller crew.