Most often, the service determines the type of fan to use. When operation occurs with little or no resistance, and particularly when no duct system…
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Whenever possible, the fan wheel should be directly connected to the motor shaft. This can usually be accomplished with small centrifugal fans and with propeller…
The horsepower required for any fan or blower varies directly as the cube of the speed, provided that the area of the discharge orifice remains…
The volume of air required is determined by the size of the space to be ventilated and the number of times per hour that the…
Various types of fans are used in air-conditioning applications and are classified as propeller, tube-axial, vane-axial, and centrifugal. The propeller and tube-axial fans consist of…
In general, it can be said that duct sizes and the depth of a duct in particular are affected by the available space in the…
For the sake of convenience, this section outlines a simplified air-duct sizing procedure, which eliminates the usual complicated engineering calculation required when designing a duct…
Table 3-2 gives the recommended air velocities in feet per minute for different requirements. These air velocities are in accordance with good practice. It should…
In any air-conditioning installation involving a duct system, invariably there is an accession of heat by the moving air in the ducts between the coils…
Air ducts for transmission of air in a forced-air heating, ventilation, or air-conditioner system must be carefully designed from the standpoint of economy, as well…