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CENTRIFUGAL VENTILATORS - ASPIRATORS 

DOA produces a complete range of ventilators/aspirators powerful, effective and easily transportable , their use of ventilation and safety in closed space is mandatory and prescribed by law before, during and after works in environment that can be dangerous , toxic, flammable or explosive like tunnels, basements, manholes, silos, holds, tanks, petrochemical plants, wells, fuel stations, warehouses , mines, laboratories , confined space excavations, sewers ducts, gas distribution networks etc .The exclusive DOA system to fix the hoses on tools allows a quick installation on the mouth by simply “button up” the hose edge on pins only by hands without needing screw drivers or belts/clamp. The volute and air fan can be washed up without problems as are in polyetilene, maintenance necessity is minimal. Very robust thanks to the construction in polyetilene and stainless steel are invulnerable to impacts rust water and from the corrosion of the majority of acids and chemical agents.

AV28H
Ventilator/aspirator
Hydraulic-------------

AV28S
Ventilator/aspiratos
Gasoline engine------

AV28E
Ventilator/aspiratos
Electric-------------

NOTES ON SAFETY IN THE USE OF THE ASPIRATORS

• For maximum safety, never use tool in aspiration if it is not known the nature of the fumes or if cannot exclude that the fumes to be sucked could be flammable or explosive, in such a case or in doubt tool must only be used as POSITIVE ventilator blowing into the ambient ventilating and making a sort of “air wash” of the ambient
• Aspiration and then centrifuging / pressurizing explosive gases makes them even more explosive in the event of a spark ignition.
• The hydraulic models, single-phase or electric single-phase, can only suck toxic or poisonous (but not explosive) fumes such as exhaust gas, welding fumes, CO2, powders etc.
• It occurred many times that in the attempt to help a victim stunned from gas also the rescuers remain victim from the gas as it was not realized the motive of the accident and the toxicity of the ambient.
• Some gas and even the lack of oxygen are odorless so can be fatal without giving suspects or signs of danger.