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Found this on Electric Fans from Old Air
TECH
What is Static Pressure when referring to electric fans?
Static pressure is the amount of restriction in front of and behind the fan. It's measured in inches of H2O (water). Some companies advertise fans using the CFM (Cubic Feet per Minute) output at zero static pressure. This means the CFM output was measured without any restrictions. In real life applications, your cooling fan will be moving air through the front grill, A/C condenser, and radiator. The back side of the fan will be exhausting air against the engine and engine compartment. All of these factors create static pressure.
What is the normal static pressure range created by a condenser and radiator in an average vehicle?
The average vehicle will have a static pressure of about .5 to .7 inches H2O static loads. Ask for the fan output rating in these static load conditions when shopping for a good fan. A reputable fan manufacturer or distributor will have a complete cure chart of CFM ratings, static pressures and amperage demands available for your use.
Listed below is a chart showing the general operating range of our fan product versus some of our competitors. As you will see our Heavy Duty High Static Load 16" fan (#17-16VHP-S) is much stronger than anyone else in our industry while our High Performance 16" fan (17-16SHP-S) is still equal or more efficient than our competitors.
Be careful when purchasing an electric fan, some manufacturers and/or distributors advertise high CFM ratings that are inaccurate and misleading to consumers as shown in the performance chart below. Do not be misled by high CFM numbers at zero static pressure that do not accurately apply to your vehicle's actual working conditions.
I have read a lot, as most of you, about a Tiger/Alger/Other Modification and even a stock Alpine with heating problems and how to resolve them. Nothing is ever really simple or purely effective at all times.
From opening the hood (Bonnet) allowing an air flow, to louvers and even side vents to allow air (heat) removal as a means of "cooling" the Alpine/ Tiger has been tried. Still we have some difficulty at times cooling our cars.
One particular part of the above article; "The back side of the fan will be exhausting air against the engine and engine compartment," is most interesting to me.
How can it be determined how much air has to be moved to cool our cars? How can we determine what degree of restrictions are present behind the radiator/fan ?
Found this on Electric Fans from Old Air
TECH
What is Static Pressure when referring to electric fans?
Static pressure is the amount of restriction in front of and behind the fan. It's measured in inches of H2O (water). Some companies advertise fans using the CFM (Cubic Feet per Minute) output at zero static pressure. This means the CFM output was measured without any restrictions. In real life applications, your cooling fan will be moving air through the front grill, A/C condenser, and radiator. The back side of the fan will be exhausting air against the engine and engine compartment. All of these factors create static pressure.
What is the normal static pressure range created by a condenser and radiator in an average vehicle?
The average vehicle will have a static pressure of about .5 to .7 inches H2O static loads. Ask for the fan output rating in these static load conditions when shopping for a good fan. A reputable fan manufacturer or distributor will have a complete cure chart of CFM ratings, static pressures and amperage demands available for your use.
Listed below is a chart showing the general operating range of our fan product versus some of our competitors. As you will see our Heavy Duty High Static Load 16" fan (#17-16VHP-S) is much stronger than anyone else in our industry while our High Performance 16" fan (17-16SHP-S) is still equal or more efficient than our competitors.
Be careful when purchasing an electric fan, some manufacturers and/or distributors advertise high CFM ratings that are inaccurate and misleading to consumers as shown in the performance chart below. Do not be misled by high CFM numbers at zero static pressure that do not accurately apply to your vehicle's actual working conditions.
I have read a lot, as most of you, about a Tiger/Alger/Other Modification and even a stock Alpine with heating problems and how to resolve them. Nothing is ever really simple or purely effective at all times.
From opening the hood (Bonnet) allowing an air flow, to louvers and even side vents to allow air (heat) removal as a means of "cooling" the Alpine/ Tiger has been tried. Still we have some difficulty at times cooling our cars.
One particular part of the above article; "The back side of the fan will be exhausting air against the engine and engine compartment," is most interesting to me.
How can it be determined how much air has to be moved to cool our cars? How can we determine what degree of restrictions are present behind the radiator/fan ?