© Email Ventilation 2013
Central Ridge Ventilator (CRV)
Applications and Description
Email Ventilation Central Ridge Ventilator is a continuous ridge-type natural extractor providing the lowest cost form of ventilation. Suitable for mounting on most roofing and material types, their profile enables good roof appearance to be maintained. Particularly suited to general ventilation for long, single-storey factory buildings, they provide continuous removal of heat, fumes, smoke and steam. With running and maintenance costs virtually nonexistent, they are of maximum benefit to industries needing continuous extraction of plant and solar heat.
Generally because of building size and the heat generated by internal processes and external solar load varies from one application to another, CR Ventilators are available in a variety of types and capacities to suit all requirements. Where the ventilation requirements vary significantly, optional dampered versions are available in the CRV600 and smaller CRV sizes. Ridge-top mounting ensures that maximum advantage is taken of nature’s law that hot air rises and is replaced at low level by cooler air.
The design of CRV combines excellent extraction with effective weather-proofing for any type or size of application. It enables the weatherability requirements of most climates and regions to be met.
Standard CRV Sizes:
A robust, heavy duty ventilator especially suited to conditions of high rainfall and high wind loading. Throat widths are 152, 229, 300, 381, 457 and 600mm. Standard construction is of Colorbond, zincalume, or aluminium.
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Standard- CRV (150, 230, 300, 380, 460, 600)
Construction details
The ventilator is made up in 2400mm long sections with an A frame at each end and at the join of adjacent sections. The A frames are factory assembled from channel section members folded up from sheet metal.
Standard construction is of Colorbond, zincalume, or aluminium. Optional extras include dampers to provide variable ventilation rates and mesh to exclude birds from the ventilator.
Central Ridge Ventilators, in all sizes, have been designed and tested to withstand winds up to 58 m/s.
The Central Ridge Ventilator can be fixed to the ridge of any type of sloped roof or flat roof. It is important that, in the latter case, the ventilator be positioned so that extraction is evenly spread over the roof or over the major source of heat.
The factory-prepared components are readily and quickly assembled on site using the rivets supplied. Full dimensional details, showing the method of fixing to roofing materials are freely available on request.
Large- CRV (900/1200)
Construction Details
The ventilator is made up in 1200mm long sections with an A frame at each end and at the join of adjacent sections. The A frames are factory assembled from channel section members folded up from sheet metal. A common problem in ventilators of this size is the disposal of water falling on the ventilator during heavy rain.
The CRV 900 & 1200 range solves this with a unique system of drainage utilising the frame members to carry the water from the top plate away from the ventilator openings and on to the roof.
Standard construction is of galvanised steel but ventilators can be readily made from aluminium or pre - finished materials such as Colorbond or zincalume. The complete ventilator is made from one material for maximum corrosion resistance. Consequently there is no requirement for expensive finishes on the structural steel framework used in some other types of ventilators of equivalent size. Bird mesh is available as an optional extra.
Extensive testing has proven the structural strength and weatherability of CRV 900 & 1200. A full series of tests at the Experimental Building Station, confirmed the exclusion of high wind rain and also the structural integrity of the ventilator for 42.5m/s winds under dynamic conditions.

High Capacity Discharge Ventilator
EV High Capacity Discharge (HCD) ventilators are designed to give maximum discharge of heat, smoke and fumes from industrial buildings of all types with the minimum size of roof openings, offering complete weather protection yet still able to cope with the most arduous conditions. The HCD ventilators provide complete flexibility with design and are aesthetically acceptable when installed.
Cladding: Suction band, cap sheets, stack and baffles from Colorbond or Zincalume
Frames: Fabricated from mild steel (minimum thickness 5mm) hot dipped galvanized after fabrication (to BS729: 1971). Frame spacing is generally at 3m centres, based on a 1.00kn/m2 wind load. (Please check local wind load conditions)
Dampers: These are an integral part of the ventilator and can be fixed or operable. Constructed from protected metal and galvanized mild steel frame.
Birdguards: Concealed birdguards available as an optional extra. Standard specification is galvanized mild steel 13mm square mesh.
Highly Corrosive Applications: Steel frames further protected with PVC coating all over, average thickness 3.2mm.
Fixings: Suitable for fixing to a wide range of roof constructions. Ventilator base frames tailor-made for each contract to suit structural steelwork. Full fixing details supplied.
Shipment: Ventilators shipped to site knocked down for site erection.
Damper Operating Systems: Available as an optional extra for control of ventilator exhaust capacity. Remotely controlled dampers are available using either electrically or pneumatically actuated control systems.
The ventilators are designed to be self cleaning and under normal conditions are maintenance free. For applications where heavy concentrations of dust or sand can be deposited within the ventilator, it is recommended that regular 6 monthly inspections are carried out to check dust build up which should then be removed once it becomes excessive.
Design Service
EV offer a comprehensive technical design service for all high heat ventilation projects.
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