Spencer single stage scroll blowers have performance ratings of 50–10,000 SCFM volume; 0–60″ H20 pressure; 0–52″ H20 vacuum. They offer stable performance from minimum rated flow without surge or pulsations and a maximum vibration tolerance of 1.5 mils total amplitude. Each radial bladed aluminum impeller is statically and dynamically balanced prior to shipment.
These blowers are suited for in-plant industrial, commercial and municipal applications and in OEM equipment for compost and wastewater aeration, temperature control, combustion air delivery, ventilation, materials handling, air curtains and drying. To allow quick selection of the best scroll blower for a specific volume/pressure requirement, there are 45 standard models, 20 impeller diameters and seven outlet sizes. Each outlet is flanged with standard ANSI B16.5 125#/150# drilling to simplify blower installation and connection. System volume adjustments can be easily made by throttling with an optional inlet or outlet damper.
There are a number of standard or optional choices for drive arrangements, materials of construction, motor types, sealing methods and discharge positions. The most prevalent drive configuration is Direct Drive Arrangement #4 with the impeller mounted directly on the motor shaft. Also available are Direct Drive Arrangement #8 with separate impeller and motor shafts, and Belt Drive Arrangement #9 for blower operation at an established speed or volume.
Spencer scroll blowers are designed to stand free on furnished cork pads; no special foundation, bolts or grout are required.