• coil run-around loops to recover sensible energy
  
• total energy wheels to recover both sensible and latent energy
  
• fixed-plate heat exchangers to recover sensible energy
  
  Providing Quiet Comfort Acceptable space sound levels enhance occupant comfort and productivity. However, system designs that promote good IAQ can adversely affect acoustics. Unlined ductwork, air handlers with solid double-wall construction and increased fan static pressures resulting from the addition of energy recovery and increased filtration can magnify the building’s background sound. Controlling noise at its source is the most cost-effective solution for providing quiet comfort in the space. "Source attenuation" can eliminate the need for duct-mounted silencers and, in turn, lower fan operating costs by reducing system static pressure. But to achieve it, you must choose:
  
• the right fan . . . FC, BI, AF, plug or Model Q™ ?
  
• the right casing construction . . . use solid or perforated double-wall? Choose lined or unlined? and . . .
  
• the right unit configuration . . . add a discharge plenum? Stack modules?

Quiet Model Q fan.

Perforated double-wall interior panels.

Trane’s new Microsoft^® Windows™ - based product selection program simplifies these decisions by providing sound power data obtained in laboratory tests conducted in accordance with AMCA Standard 300. With it, you can accurately predict the acoustical performance of a particular Modular Climate Changer configuration at design operating conditions — then optimize your selection for sound and performance. (Comparative sound data for other air handling equipment should be based on AMCA Standard 300 testing for the entire air handling unit configuration rather than fan sound performance alone.)