Our blowers / fans provide high efficiency, low noise, clean air, handling dust. Centrifugal fan impeller designs include: backward bladed, backward inclined laminar, backwardly curved, backwardly inclined aerofoil, flat backward inclined wheel, forward curved impeller, radial paddle blade and radial blade high pressure blowers, as well as gas burner fans / blowers, Industrial blowers, High pressure blowers, Low pressure blowers, High volume ventilators, Low volume blowers.
OLEG FAN BLOWER

Type REBC Recirculating (exhaust/recirculation) Roof Ventilator

APPLICATIONS: Type REBC recirculators are multi-purpose power roof ventilators, used for exhaust or recirculation. They are suggested for use in commercial and industrial applications where there is sufficient ceiling height to create a temperature differential between the floor and ceiling. These applications include factories, warehouses, and large commercial buildings. Type REBC recirculators function as normal power roof ventilators in warmer weather and as an energy-saving recirculation system in cold weather. Each unit is equipped with a reversible fan that redistributes warm ceiling air throughout the plant and reduces the building’s heating requirement. With the flip of a switch, it can function as a conventional roof ventilator.

CONSTRUCTION: Type REBC PRVs can exhaust to the outside, or recirculate inside building air. With the addition of an optional modulating damper motor, various amounts of outside air may be mixed with recirculated inside building air. The fan/damper plenum is suspended from a roof opening, and a hood and base are mounted to a curb above the opening on the roof. The hood and base are made of galvanized steel. An exterior finish coat of epoxy can be specified. Motor operated, center pivoted dampers are located in the sides of the plenum and at the top of the plenum in the throat of the roof curb. Dampers are linked together so that as the throat damper closes, the plenum dampers open and vice versa. All dampers are shipped installed in the plenum. When the direction of airflow is up, the dampers in the sides of the plenum are closed and the damper at the top of the plenum is opened creating an exhaust PRV. When the direction of airflow is reversed and the damper arrangement is not changed, the unit acts as a supply PRV. With the direction of airflow down and the damper positions reversed, a recirculating unit is created. For directing airflow from the plenum into the plant area aThree-Way Diffuser is used. It is shipped mounted to the plenum. The 14 gauge frame and 20 gauge blades are constructed of galvanized steel. MODULATING DAMPER MOTOR is desirable to maintain a predetermined inside temperature by mixing varying amounts of recirculated plant air and cool outside air. The modulating motor, complete with linkage, electronic temperature controller and transformer are mounted within the plenum. A remote temperature sensor with set point is also provided for mounting and wiring in teh field.

A simple roof ventilator is essentially an opening in the roof with a cover to keep out rain and to prevent winds from interfering with its functioning. Natural convection is an appreciable aid to ventilation in a large building only if it contains sources of large amounts of heat. A further useful adjunct is a fan fan, device for agitating air or gases or moving them from one location to another. Mechanical fans with revolving blades are used for ventilation, in manufacturing, in winnowing grain, to remove dust, cuttings, or other waste, or to provide draft for a fire. The addition of distribution ducts to the fan and a system for forcing air into the building provides greater efficiency. Outlets are designed to attain maximum mixing of air and to move large amounts of air at low velocity so that temperature layers are eliminated. Factories have special suction hoods and enclosures to draw away localized dust, fumes, and heat. Incoming air may be cleaned of dust by filters or electrostatic precipitators. Natural ventilation depends on winds outside and convection currents inside a building. Winds raise air pressure slightly on the windward side of a building and lower it slightly on the lee side. The pressure difference promotes circulation into the building on the windward side and out of it on the lee side. Convection currents are caused by the sinking of colder and therefore heavier air, which displaces the warmer air. A building may have a roof ventilator to allow the rising warm air to escape. If there is an opening to the outside at the bottom of the building, fresh, cool air will be drawn in.