Air handling units (AHUs) are common in the mechanical rooms of large buildings. These mechanical rooms are designed with small footprints to maximize tenant space, leaving minimal room for noise control. As a result, the mechanical room, and in turn the air handling unit, is often situated close to the occupied space. Without a proper noise control solution, a noise problem will likely occur. AHUs are available with numerous fan types, orientations and configurations, all of which have different flow distribution requirements and static capabilities. Selecting a silencer that ensures the fan is operating the way it was designed s a challenge.The type, shape and size of the silencer does not only depend on the required insertion loss. Silencers with flow shaping internals help minimize pressure drop and provide uniform air distribution for fan intake and discharge.EX casing silencers are designed with the acoustic media out of the airstream, resulting in noise reduction at no added pressure drop (compared to ductwork).

Projects: Baystate Medical Center, Metropolitan Life Office Building, IBM Celesticaair handling unit properties Noise can break-out of duct walls and into the occupied space. top brand central ac unitsThis usually occurs at the point of entry into a room.3 ton package unit priceEven if the silencer is located right at the noise source, noise from other equipment in the mechanical room can break in to the ductwork after the silencer and result in a noise problem. An acoustical analysis is required to determine how much breakout will occur and where the noise is likely to break out of the ductwork.HTL (High Transmission Loss) silencers and sometimes HTL ductwork is recommended in mechanical rooms where break-in is possible. Installing a silencer at the wall between the mechanical room and the occupied space will reduce break-in before and prevent breakout noise from reaching the occupied space.

Projects: Charles Tupper Office Building, CBC Headquarters, Fredonia Opera House Noise traveling through the ductwork and out of the diffusers and return grills is a problem that should be addressed at the design stage. However, where to locate the silencers, obscure duct transitions and precise calculation of the amount of silencing required are common issues that designers run into. This process always needs to start with a systems analysis that includes transmission loss calculations, aerodynamic analysis and a survey of the project-specific requirements (space, IAQ, pressure drop, and cost). A project-specific solution can then be selected and applied.Projects: Metro Center, Lietrim Computer Center, CBC Headquarters 2 AHUs usually require intake and discharge silencing solutions, however cramped layouts often don’t allow the room for them. In addition to space restrictions, shorter duct runs pose the problem of increased System Effects and potentially generated noise.

Fit-the-system silencers, which take the shape of the duct, enable designers to achieve the insertion loss required across all bands in the limited duct space available, while also keeping system effects to a minimum.ASHRAE recommends 3-5 duct diameters on either side of a silencer, however this amount of space is rarely available. Fit-the-system silencers help overcome space restrictions that most consultants face on a regular basis.Projects: Baystate Medical Center, Waterpark Office Building, IBM Celestica, Niagara Courthouse Theater Ventilation is a primary engineering control available to reduce the concentration of  gases, dusts, vapours, smoke, and fumes in the air. These pollutants are drawn into the ventilation system and carried to the collecting device by a pressure gradient created by the fan. The fan must have sufficient power to overcome the resistance to air flow created within the General ventilation systems are used primarily to control

temperature and humidity, to remove odours, and sometimes to remove traces of toxic substances and micro organisms emitted from carpeting, panelling, furniture and people. It is not suitable for controlling exposure to toxic substances as it actually spreads the contaminant throughout the workplace before Ventilation is to design a system capable of restricting the high-level temperature rise inside the building to a pre-determined level above the prevailing outside ambient temperature by creating a minimum air change rate per hour. These systems provide positive, fresh air movement to central working areas within the building that in turn provide evaporative cooling for the operatives at theirDue to the relatively low capital cost, in relation to the highly desirable conditions achieved, this is the most common approach within industrial General industrial ventilation systems, clean rooms or process ventilation can be provided by the use of

centralised Air Handling Units. This site provides an outline of the products and services we can offer you, however for further information or to arrange a free no obligation site visit click here to contact us via E-Mail or call 01709 577444! General Fume & Heat Extraction Paint Mixing Fume Extraction Click to enlarge image Click to enlarge imageThe benefits under 35 U.S.C. 119 are claimed of provisional patent application 61/395,248 filed May 11, 2010. Most residential and commercial buildings utilize air handling units for the purpose of enclosing heating, ventilation and air-conditioning equipment (HVAC). Air handling units are typically hung in basements or attics and function to circulate heated or cooled air throughout the building. Usually air handling units are installed with little or no attention to the need for proper drainage of moisture which inherently accumulates in the unit. This accumulation of moisture ultimately results in the growth of mold in the unit which naturally worsens over time if it doesn't receive prompt attention.

Without proper removal, the mold and mildew will cause undesirable and adverse effects on the health of the occupants of the building. By this invention, a mounting system for an air handling unit includes four elongated rods attached at the upper ends thereof to floor joists by means of adjustable fastener assemblies. Two of the rods are attached, respectively, to a pair elongated supports disposed below the air handling unit by means of angular support assemblies. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS FIG. 1 is an end view of one embodiment the air handling unit mounting system according to this invention; FIG. 2 is a side view of the system; FIG. 3 is a perspective view of the system; FIGS. 4, 5 and 6 are views similar to FIGS. 1, 2 and 3, respectively, and show a modification of the invention. In the drawings, the numeral 1 designates an air handling unit which is attachable to floor joists 2 by means of four elongated rods 3 which are attached, respectively, to floor joists 2 by means of fastener assemblies 4.

Details of fastener assemblies 4 include angle bracket 5, screw 6, lock nut 7, washer 8 and rubber grommet 9. Adjustment of lock nut 7 allows for the raising or lowering of air handling unit. Further, rods 3 are attached at their lower ends to a pair of spaced elongated angular supports 10 by means of support assemblies 11. To facilitate the assembly operation, the ends of elongated supports 10 extend beyond the vertical walls of air handling unit 1. Support assemblies 11 include lock nut 12, washer 13 and rubber grommet 14. Also, to prevent slippage, cork strip 15 extends substantially the length of elongated support 10. The mounting system, as shown in FIGS. 4, 5 and 6, is essentially the same as that shown in FIGS. 1, 2 and 3 and is for use in a tongue and groove integrated (TGI) floor system. A TGI floor system embodies a pair of spaced 2×3 boards 16 and 17 interconnected by a sheet of plywood 18 by means of a tongue and groove connection. The TGI is used mostly in multi-story buildings requiring the support of heavy loads.

By this invention, brackets 19 are attached by means of self tapping screws 20 to top and bottom boards 16 and 17 of the floor system. If brackets 19 are only attached to lower board 17, the weight of the air handling unit would cause the screw to pull away from the board. By attaching brackets 19 to both boards 16 and 17, the air handling unit is secured in place and won't become detached. Rods 3 are attached to brackets 19 by means of fastener assemblies including bolt and lock nut combination 21 together with lock nut, washer and rubber grommet combination 22. Manipulation of lock nut combination 22 allows for vertical adjustment of rods 3. Once the hanging system is installed with air handling unit 1 in position, and as shown in FIGS. 3 and 6, air handling unit 1 is adjustable front to rear by the manipulation of rods 3 and the associated fastener means to tilt the air handling unit to the proper position so that moisture which normally collects in the unit is allowed to condense and flow away from the unit without accumulating within the unit itself.