Metro – C.E.V.
For cabinets and enclosures in outdoor or remote areas where equipment rooms are unavailable or undesired – for non-extreme environments
The Metro unit maintains internal cabinet temperature by allowing controlled external ventilation and internal circulation to avoid ‘hot spots’. This gives the housed electronics and batteries the ability to work at their maximum performance levels through seasonal weather variations.
The Metro’s are manufactured to suit any type of cabinet/enclosure. They provide an ideal environment for your equipment that’s reliable, secure, economical and safe.
External vents are fitted with rain hoods and filters to protect against weather, dust and insects. The upper vent allows ventilation to prevent hydrogen build-up.
Ventech recommends the use of Polyester or Polycarbonate enclosures or cabinets depending on specific installation requirements and environmental conditions.
Remote cell sites – airport runways – traffic lights – weather tracking stations – lighthouses – security systems – basements – roof tops – car parks
Test Results 150W Heat Load
With a heat load of 150 watts inside the cabinet and the venting system set to operate at 25°C it can be seen that the internal cabinet temperature is maintained well above the ambient temperature until the venting system operates.
The black dotted line tracks TAMBIENT and TCABINET as if there were no restrictions to heating or cooling
Test Results 265W Heat Load
With an internal heat load of 265 watts and the venting system set to operate at 25°C, the operational temperature shape of the cabinet is clear. TMAX 24.2°C, TMIN 5°C gives a – Delta_Sign.jpgT3 of 19.2°C where temperatures are reasonably constant. Below TMIN, cabinet temperatures are still maintained well above the ambient temperature.
|NZ2004/000173||Patent Co-operation Treaty||Granted|
Circulation and External Venting Unit
Internal enclosure temperature is influenced by
weather conditions and from heat generated by
housed components. When ambient temperatures
are high or peak load is reached, the CEV
allows air to pass through components via the
lower vent and filter, then in to the atmosphere
lowering enclosure and component temperature.
When component load is less or ambient temperatures
become cooler the thermostatically controlled
CEV will operate and close. This traps any
remaining component heat in the enclosure to
maintain temperature. The CEV circulates air
through the enclosure providing an average
internal air temperature for the control
thermostats and alleviates component hot spots.
Fire Test Standard
Filter Mat Specifications
|Made of chopped-fibre mat with a progressive structure|
Temperature resistant to 100ºC
Self extinguishing category F1 to DIN 53 438
Reliable filtering of virtually all types of dust from a particle size of 10µm