I've got a rattle coming from my heating and air system. Air handlers are an important component to any HVAC system. Usually, an air handler is a large metal box containing a blower, heating and/or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to ductwork that distributes the conditioned air through the home, and returns it to the air handler. Sometimes air handlers discharge and admit air directly to and from the space served, without necessary ductwork. Air handlers typically are comprised of: Blower/fan – usually located in a large squirrel cage blower driven by an electric motor to move the air. The blower may operate at a single speed, offer a variety of pre-set speeds, or be driven by a variable drive so as to allow a wide range of air flow rates. Heating and/or cooling elements - depending on the location and the application, air handlers may need to provide heating, or cooling, or both to change the supply air temperature.

Filters – air filters are almost always present and needed in order to provide clean dust-free air to the home interior. Humidifier - is often necessary in colder climates where continuous heating will make the air drier, resulting in uncomfortable air quality and increased static electricity. Mixing chamber - to maintain indoor air quality, some air handlers commonly allow the use of outside air into, and the exhausting of air from the home. A mixing chamber is used with dampers to control the ratio between the return, outside, and exhaust air. Controls - are necessary to regulate every aspect of an air handler, such as: flow rate of air, supply air temperature, mixed air temperature, humidity, air quality. Common control components include temperature sensors, humidity sensors, sail switches, actuators, motors and controllers. Vibration isolators - since blowers in an air handler can create substantial vibration, are normally inserted into the duct immediately before and after the air handler and often also between the fan compartment and the rest of the air handler.

An air handler is usually located in the garage, a closet, or in the attic unless it is part of a package HVAC unit, then the air handler is incorporated in the system. The air handler can be an up flow air handler, down flow air handler, or horizontal flow air handling unit. Call our experienced technicians at One Hour Heating & Air Conditioning®, and we’ll go over your options with you. A family of home services: Strong partnerships and a national support system. Independently owned and operated.This line of our floor-by-floor air handling products is specifically designed to meet the unique requirements of underfloor air systems. Our raised floor line, like all of our equipment, is designed to have low fan energy, have very quiet operation, and have a compact space footprint. Most of our equipment is vertical in dimension until approximately 18,000 CFM, upon which our design becomes horizontal.About Air Handling Units Data centre air handling units (AHUs) come in a number of different configurations.

The most common types are as follows: Down-flow – this is the most common type of air handler experienced in enterprise data centres. The term down flow refers to the way the air moves through the unit. wholesale home ac unitsIn this configurations exhaust air from the servers enters the top of the AHU, is pulled across a cooling coil and blown, by internal fans, into the data centre’s under-floor plenum. york air handling unit selectionThese units generally have EU4 filtration or similar internally and can be combined with direct fresh air systems. ac unit em heatDown flow units are deployed using either chilled water or direct expansion cooling systems, or a combination of the two together in some free-cooling applications. Up-flow – generally only encountered in legacy data centres up flow air handling units work the opposite way to down flow units.

Due to advances in aisle containment technology and data centre design up flow units are very rarely deployed in new data centres. Both Down-flow and Up-flow AHU’s are often still referred to as CRAC Units or simply CRAC’s, from their historic name i.e. Computer Room Air Conditioning Units In-Row – originally brought to market by APC most AHU manufacturers now have an in-row product offering. Whereas up and down flow systems move the air vertically in-row units move air horizontally, pulling it directly from the hot aisle, cooling it, then delivering it directly to the cold aisle. Within certain sets of physical constraints in-row units do have advantages over vertical air flow systems. In-rows are very efficient in their use of fan energy as there is no external resistance to the air flow and they offer high cooling duties relative to their footprint. Rear door heat exchangers – both active and passive rear door systems, like in-row systems, move the air horizontally.

Rear door systems place the cooling coils at the rear of the server cabinet and can support very high densities. They are extremely space efficient and offer even greater cooling duty per m2 of floor space than In-row cooling. With good design and the right configuration of heat rejection plant they can provide exceptional energy efficiency. These are some of the more common air handling systems used in today’s data centres. There are others and it is important to note is that each configuration will have different pro’s and con’s depending upon the particular requirements and constraints of each application. When it comes to data centre air flow there is no “one size fits all” solution. Depending on the physical constraints associated with your specific building or location any of the above could be best. By working with Future-Tech we can help establish your project’s unique drivers, requirements and constraints and with this information we will select the air handling solution that best achieves your projects goals.