Trane Modular 20 to 35 Tons Parts List download pdf (Page 12)

12 PKG-PRC003U-EN

Application Considerations

Self-Contained Acoustical Recommendations

Successful acoustical results are dependent on many system design factors. Following are general

acoustical recommendations. For more information, or if there is concern about a particular

installation, contact a professional acoustical consultant.

Location and Orientation of the Mechanical Equipment Room

Locate the equipment room adjacent to stairwells, utility rooms, electrical closets, and rest rooms

if possible. See Figure 4, p. 12.This minimizes the acoustic effects and risk of workmanship or

installation errors. Place the discharge and return air ductwork over these less acoustically

sensitive areas, using vertical or horizontal fresh air shafts. Consult code requirements for fresh air

and smoke purge constraints.

Return Air Ductwork

Duct the return air into the mechanical equipment room. Connect ductwork to the unit if local code

dictates.The return air ductwork must have an elbow inside the equipment room. Extend the

ductwork from the elbow far enough to block the “line of sight” to the exterior of the equipment

room. Use a minimum ductwork length of 15 feet to the equipment room exterior. Line the duct with

two-inch, three-pound density insulation. Use multiple, small return ducts for better acoustical

performance to the occupied space.

Supply Air Ductwork

Insulate the supply air duct with two-inch, three-pound density insulation. Extend this lining at least

15 feet out from the equipment room wall, keeping the duct aspect ratio as small as possible.

Minimize large flat panels since they transmit sound. In addition, small aspect ratios will minimize

potential “oil canning” of the duct due to flow turbulence.

Figure 4. Equipment room location and orientation

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Trane Modular 20 to 35 Tons Parts List Page 12