Romlair - Model P - Sidewall Propeller Fans

A wide variety of fans to choose from including:

• Three airflow directions; exhaust, supply and reversible 
• Fans include both belt drive and direct drive 
• Filter housing options available 
• Custom Design: Several blade designs to achieve low sound and optimum performance

• Cast Aluminum Airfoil Propeller: Model PA and Model P feature a cast aluminum airfoil type designed for high volumes at higher pressures. They are also used in non-sparking applications.
• Fabricated Steel Propeller: Model PS features a fabricated steel propeller design to run at lower fan speeds which results in lower sound levels. These models are available up to 60”. 
• Advanced Design Polypropylene PPG Propellers: Special fan designs feature polypropylene propeller designed for all conditions, and the highest of performance at low and high static pressures. Consult with the factory to assist in selecting your optimal propeller.

Belt Drive vs. Direct Drive

• Ability to adjust fan speed for system balancing 
• Belt Drive typically more cost effective 
• Direct drives favorable where access is difficult 
• Maintenance costs are generally lower with direct drive fans

Larger Fans vs. Small Fans

• Larger fans turn slower and generate less sound but have higher initial cost and lower operating costs 
• Smaller fans have lower initial costs and more stable performance, but higher sound levels and higher operating costs 

Motor Service Factor 

• Motors in sidewall fans are cooled by the air stream. If the flow of cooling is uninterrupted, motors may be operated in their service factor up to 20% above the motor’s nameplate. However, when 1.2 Bhp service factor is not desirable for the application specify the next higher motor hp.

The split drawing shows a Type 1 and Type 2 installation for mounting fans when a wall housing or wall collar is not used. The wall openings are different on the Type 1 and Type 2 installations.

On exhaust applications, it is important to maintain  minimum dimension between the propeller and damper for maximum performance.

Type 1 installation requires a metal spacer between the fan and the wall to achieve the minimum distance  recommendation. This type of installation uses a damper the same size as the fan propeller.

Type 2 installation requires a minimum wall opening to allow the fan venturi to fit inside the wall opening. This type of installation uses a damper the same size as the venturi O.D.

The chart below provides the recommended minimum  dimensions and the wall opening dimensions for these two different installations.

Romlair Sidewall fans can be mounted horizontally for  applications that  require vertical airflow. 

Some applications would include mounting fans in a wall housing for use as recirculation fans, or install them in  ductwork and use them as transfer fans. All models can be mounted horizontally. On horizontal applications, specify motor location and direction of airflow

Note: Guarding is recommended on this type of  application. If guarding is not provided by the factory, it should be  supplied by others