Does Your Home Need Fans as well as Air-Conditioning

Roof attic ventilation in an air conditioned home or office can be just as important , or even more vital than the air-conditioning or heat pump system themselves .A roof fan can be simply housed in an assembly mounted over a hole or holes cut into the roof.

The first and most important decision when it comes to making decisions about fan ventilation systems is the decision as to what type of fan system you actually need when it comes time for ventilation on your premises. The fan setup may be for cooling or air conditioning purposes. They may be permanently installed within a system or they may be stand alone solitary units which you may of purchased at your local retailer , big box store or hardware outlet. Just as various and different types of ventilation hoods suit widely varying different applications across the waterfront so do various types of fans have different specific and indeed widely varying applications.

The basic parts and setup of a centrifugal fan are the housing , shaft with bearings, the impeller wheel or what some call "the rotor", an outlet discharge along with fan pulley (sheave) and lastly of course the motor. The most commonly used axial fan variety is the "propeller" fan type. Propeller fans successfully provide cooling and dilution ventilation. They are good air movers because they carry large volumes of air all the while using a minimum of electrical current and power. However they are rarely used in local exhaust ventilation systems since they can withstand only very little resistance. A drawback of the FC forward curve squirrel caged fan is motor burnout caused by electrical power overloading. But on the other side of the equation are the facts that since FC forward curved fans are so widely available on the marketplace and thus not only prevalent but also relatively inexpensive that burned out motors can be replaced both in a flash and with low cost structures. Thus a standard and inexpensive forward curved squirrel fan setup may still be a wise and good choice and overall choice when the alternatives call for a a more expensive and costly fan that does not burn out quickly. This choosing the squirrel cage variety of fan may provide for the best overall economy of operation and maintenance over the short and long run. Propeller fans as used in a household window fan , a double window fan, or a large panel fan can be used in a studio or shop to exhaust hot air or for dilution ventilation of solvent vapors. For example if you operate a small electric enameling kiln in a room, a household window fan eighteen inches in diameter , will give you some relief from heat and will dilute the metal fumes.

A second and radically different type of centrifugal fan is the backward inclined or "BI " fan. A backwards inclined fan has its blades arranged in a configuration opposite the direction of rotation. These are mostly used with clean air. However they also can be used for light dust loads, although the blades can no doubt become clogged with solid material reducing air flow. Centrifugal fans themselves then again are divided into several different types and formats. Forward curved centrifugal fans overall have low space requirements coupled with a disadvantage of low top speeds. Yet this apparent disadvantage works in a contrary fashion to provide for relatively silent and quiet operation. Their mechanical efficiency and sets of efficiencies are relatively good and basic. It can be said and summarized that for a given set of air capacities that their rotation speeds are usually less and slower than other comparable sets of fans. One other set of factors to consider when choosing a fan type suitable for the setup may well involve questions and concerns of operating temperature and temperatures. Fan bearings and other features may need to withstand high temperatures. For example , sleeve bearings are suitable to 250 degrees Fahrenheit, ball bearings to 550 degrees F. Special cooling devices are required at higher temperatures. Check with your manufacturer or service tech for specific instructions. In the furnace and air conditioning trades the three most common wheels are the forward curve (FC), the backward inclined (BI) and the radial or "straight blade".

Many factors determine the "right" or "best" choice of fan type , model or brand. Keep in mind that that overall what you most likely want and prefer is the fan that uses the least amount of energy to move the most air and air flows. The specific task should be to select a fan that will move the required amount of air against the resistance of the ventilation system or systems. In choosing a fan, you should realize that each and every fan is designed to run the most efficiently at a particular speed for a given system resistance. As a general and overall rule in the heating and ventilation trades you can rely on a propeller fan to deliver 1,000 cubic feet per minute rate (CFM) for each square foot of fan surface area space. Yet given heating and air conditioning engineers and mechanics the discussion and debate can go on almost to no end or definite single choice. It can be summarized as "different strokes for different types of folks". There are the different fan types for different applications or setups. Still in many circumstances it comes down to personal preferences and vendor stocking and availability. Parts and service support is yet another consideration in the marketing and support mix. To the greatest degree it usually comes down to personal and professional individual choices and preference.

What may be one contractor's best and wisest choice may be to the disdain of the next builder or heating trades person giving you or your family their best considered professional advice and workup estimate. The apparatus may be for cooling ,heating or ventilating purposes and work. Yet in the end it comes down to matching design benefits and performance to needs. In economics it is supply and demand. In the heating and ventilating trade its reliability, air movement and final operating costs. The fan setup may involve considerations other than simple ventilation only . Take for example the case when explosiveness or flammability works itself as a basic design parameter and risk consideration set of factors. Explosiveness or flammability of materials that require non-sparking construction will involve non-ferrous blades and an explosive proof motor and housing. One other consideration that may well come into play into the choice of which and what type of fans are chosen may be space limitations and concerns about noise and ambient noise levels. Involved in choice are not only the hardware itself but also operating costs over the long term. Include in the award decision hydro and electrical and power costs over the long run of the operating lifespan of the setup.

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<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN' 'http://www.w3.org/TR/html4/loose.dtd'><html><head><title>Articles Back Link | Does Your Home Need Fans as well as Air-Conditioning</title></head><body><h3>Does Your Home Need Fans as well as Air-Conditioning</h3><br><br> By: Terry S Vostor<br><br><p><p>Roof attic ventilation in an air conditioned home or office can be just as important , or even more vital than the air-conditioning or heat pump system themselves .A roof fan can be simply housed in an assembly mounted over a hole or holes cut into the roof.</P><p>The first and most important decision when it comes to making decisions about fan ventilation systems is the decision as to what type of fan system you actually need when it comes time for ventilation on your premises. The fan setup may be for cooling or air conditioning purposes. They may be permanently installed within a system or they may be stand alone solitary units which you may of purchased at your local retailer , big box store or hardware outlet. Just as various and different types of ventilation hoods suit widely varying different applications across the waterfront so do various types of fans have different specific and indeed widely varying applications.</P><p>The basic parts and setup of a centrifugal fan are the housing , shaft with bearings, the impeller wheel or what some call "the rotor", an outlet discharge along with fan pulley (sheave) and lastly of course the motor. The most commonly used axial fan variety is the "propeller" fan type. Propeller fans successfully provide cooling and dilution ventilation. They are good air movers because they carry large volumes of air all the while using a minimum of electrical current and power. However they are rarely used in local exhaust ventilation systems since they can withstand only very little resistance. A drawback of the FC forward curve squirrel caged fan is motor burnout caused by electrical power overloading. But on the other side of the equation are the facts that since FC forward curved fans are so widely available on the marketplace and thus not only prevalent but also relatively inexpensive that burned out motors can be replaced both in a flash and with low cost structures. Thus a standard and inexpensive forward curved squirrel fan setup may still be a wise and good choice and overall choice when the alternatives call for a a more expensive and costly fan that does not burn out quickly. This choosing the squirrel cage variety of fan may provide for the best overall economy of operation and maintenance over the short and long run. Propeller fans as used in a household window fan , a double window fan, or a large panel fan can be used in a studio or shop to exhaust hot air or for dilution ventilation of solvent vapors. For example if you operate a small electric enameling kiln in a room, a household window fan eighteen inches in diameter , will give you some relief from heat and will dilute the metal fumes.</P><p>A second and radically different type of centrifugal fan is the backward inclined or "BI " fan. A backwards inclined fan has its blades arranged in a configuration opposite the direction of rotation. These are mostly used with clean air. However they also can be used for light dust loads, although the blades can no doubt become clogged with solid material reducing air flow. Centrifugal fans themselves then again are divided into several different types and formats. Forward curved centrifugal fans overall have low space requirements coupled with a disadvantage of low top speeds. Yet this apparent disadvantage works in a contrary fashion to provide for relatively silent and quiet operation. Their mechanical efficiency and sets of efficiencies are relatively good and basic. It can be said and summarized that for a given set of air capacities that their rotation speeds are usually less and slower than other comparable sets of fans. One other set of factors to consider when choosing a fan type suitable for the setup may well involve questions and concerns of operating temperature and temperatures. Fan bearings and other features may need to withstand high temperatures. For example , sleeve bearings are suitable to 250 degrees Fahrenheit, ball bearings to 550 degrees F. Special cooling devices are required at higher temperatures. Check with your manufacturer or service tech for specific instructions. In the furnace and air conditioning trades the three most common wheels are the forward curve (FC), the backward inclined (BI) and the radial or "straight blade".</P><p>Many factors determine the "right" or "best" choice of fan type , model or brand. Keep in mind that that overall what you most likely want and prefer is the fan that uses the least amount of energy to move the most air and air flows. The specific task should be to select a fan that will move the required amount of air against the resistance of the ventilation system or systems. In choosing a fan, you should realize that each and every fan is designed to run the most efficiently at a particular speed for a given system resistance. As a general and overall rule in the heating and ventilation trades you can rely on a propeller fan to deliver 1,000 cubic feet per minute rate (CFM) for each square foot of fan surface area space. Yet given heating and air conditioning engineers and mechanics the discussion and debate can go on almost to no end or definite single choice. It can be summarized as "different strokes for different types of folks". There are the different fan types for different applications or setups. Still in many circumstances it comes down to personal preferences and vendor stocking and availability. Parts and service support is yet another consideration in the marketing and support mix. To the greatest degree it usually comes down to personal and professional individual choices and preference.</P><p>What may be one contractor's best and wisest choice may be to the disdain of the next builder or heating trades person giving you or your family their best considered professional advice and workup estimate. The apparatus may be for cooling ,heating or ventilating purposes and work. Yet in the end it comes down to matching design benefits and performance to needs. In economics it is supply and demand. In the heating and ventilating trade its reliability, air movement and final operating costs. The fan setup may involve considerations other than simple ventilation only . Take for example the case when explosiveness or flammability works itself as a basic design parameter and risk consideration set of factors. Explosiveness or flammability of materials that require non-sparking construction will involve non-ferrous blades and an explosive proof motor and housing. One other consideration that may well come into play into the choice of which and what type of fans are chosen may be space limitations and concerns about noise and ambient noise levels. Involved in choice are not only the hardware itself but also operating costs over the long term. Include in the award decision hydro and electrical and power costs over the long run of the operating lifespan of the setup.<br></P></p> <br><br> <b>Author Resource:-></b>  <br><br><b>Article From</b> <a href='http://www.articlesbacklink.com/'>Articles Back Link</a><br></body></html>