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2. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   When a centrifugal fan is specified for a given CFM and static pressure at conditions other than standard, an air density correction factor must be applied to select the proper size fan to meet the new condition. Since 200 °F (93 °C) air weighs only 80% of 70 °F (21 °C) air, the centrifugal fan creates less pressure and requires less power.

3. Axial fan design - Wikipedia

   en.wikipedia.org/wiki/Axial_fan_design

   An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Factors which determine the performance of the fan include the ...

4. Industrial fan - Wikipedia

   en.wikipedia.org/wiki/Industrial_fan

   Vaneaxial fans – These axial flow fans have a higher pressure capability due to the presence of static vanes. Variable pitch axial fans – The blades on these axial fans are manually adjustable to permit the blade angle to be changed. This allows operation over a much wider range of volume/pressure relationships.

5. Compressor map - Wikipedia

   en.wikipedia.org/wiki/Compressor_map

   A low pressure ratio fan (such as that used on a high bypass ratio turbofan) has a range of working lines. At high flight speeds, the ram pressure ratio factors up the cold nozzle pressure ratio, causing the nozzle to choke. Above the choking condition, the working lines tend to coalesce into a unique steep straight line.

6. Pratt & Whitney F119 - Wikipedia

   en.wikipedia.org/wiki/Pratt_&_Whitney_F119

   It has a three-stage fan driven by a single-stage low pressure turbine and six-stage high pressure compressor driven by single-stage high pressure turbine. The shroud-less fan has wide-chord, low aspect ratio hollow titanium fan blades that are linear-friction welded to the disks to form single-piece integrally-bladed rotors (IBRs), or blisks ...

7. These Top-Rated Exhaust Fans Are Just What Your Musty ... - AOL

   www.aol.com/lifestyle/exhaust-fans-help-control...

   Exhaust fans keep fresh air circulating in your home. Say goodbye to steamy bathrooms, stuffy garages, or smoky kitchens with the best exhaust fans. These Top-Rated Exhaust Fans Are Just What Your ...