whole house fan
Effective ventilation systems are often built with the use of fans, that provide effective removing of the bad air, drawing it through the hood, and duct system, air cleaning devices and (or) exhaust to the outdoors Ventilation (architecture) - Wiki. There are only 2 main design of exhaust fans: axial Fans look like propellers and draw the air straight through the fan; centrifugal fans look like "squirrel cages" that draw air into the center of the device and exhaust it at a 90-degree angle.
There are three types of centrifugal fans determined by the type of fan blades: forward inclined blades, backward inclined blades, and straight radial blades. Centrifugal fans are great for high resistance, that is usual for local exhaust ventilation systems: home furnaces, vacuum cleaners, and hair dryers. Rugged radial blades of the centrifugal fans are least likely to become abraded or clogged by the dust, so they works great for exhausting of heavy dust amounts.
There are three basic types of axial: propeller, tubeaxial, and vaneaxial. Propeller fans are usually used for dilution ventilation or cooling and they are often mounted in a wall or ceiling. You surely know this type: free standing room or automobile radiator fans belong to this type. These fans can move large amounts of air if there is little resistance, and are not suited for local exhaust ventilation because they do not provide enough suction to draw air through the system. Vaneaxial and tubeaxial devices are fans made to fit in a duct for clean air applications, for example for roof exhaust ducts.
Ceiling fans help reduce energy usage while creating a cool breeze; they can also be used in the winter to help circulate warm air. A ceiling fans are mechanical ones, usually electrically powered, suspended from the ceiling of a room, that uses hub-mounted rotating paddles to circulate air; they cool people by introducing slow movement into the otherwise still, hot air of a room. Harbor Breeze ceiling fans are one of the most known brand, they are made in China and it is Lowe’s store brand.
Dryer booster fans feature quiet, efficient backward curved impellers that are capable of overcoming long duct runs, and an in-line configuration that simplifies installation. For ducting dryers the perfect solution is to run the dryer duct near the wall behind the dryer – with a duct run not more than 1 foot. But a short dryer duct length is not always possible, real situation is often far from perfect - this is where you need the dryer booster.
