Sierra Fresh Air Systems
Stressing Environmental Responsibility and Sustainability

EVAP Indirect/Direct Evaporative Cooling System - Model Aztec



  • Multi-stage rooftop evaporative cooling system for make-up and ventilation
  • As much as 30° drop at 100°/74° F design conditions
  • Provides up to 119% saturation efficiency
  • Performance far exceeding typical evaporative systems
The Sierra Aztec evaporative cooling system is the ultimate in energy efficiency, providing impressive reductions in supply air temperatures rivaling mechanical refrigeration. The Aztec uses a first stage integrated stainless steel cooling tower and cooling coil to provide cooled air to a second stage direct evaporative section, delivering performance of up to 30 EER. Available in sizes from 1500 to 37500 cfm, the Aztec is also available with a heating section up to 1.4 MBH input.

"A" SERIES MODEL CFM RANGE NOMINAL COOLING EFFICIENCY OPTIONAL GAS HEAT MAX. MBH INPUT BASIC UNIT FOOTPRINT LxWxH AVAILABLE ARRANGEMENTS APPROVALS AVAILABLE ACCESSORIES
ASC-5 1,500-2,500

Indirect Only - 75%

Indirect/Direct - 110%-118%

200 188-5/6"x52"x42-1/2" Horizontal ANSI, FM, & IRI Controls Available on Optional Gas Heat Section Flat Bank Filter Section with Nominal 2" Pleated or Cleanable Filters, Discharge Shut-off Damper and Modulating Mixing Dampers
ASC-7 2,500-3,500 400 190-13/16"x56"x48-1/2"
ASC-10 3,500-5,000 400 203-3/4"x64"x55-1/2"
ASC-15 5,000-7,500 600 225-1/4"x71"x66-1/2"
ASC-20 7,500-10,000 600 241-5/16"x84"x66-1/2"
ASC-25 10,000-12,500 1,000 250-5/16"x89"x74-1/2"
ASC-30 12,500-15,000 1,000 254-3/8"x92"x80-1/2"
ASC-40 15,000-20,000 1,400 280"x106x92-1/2"
ASC-50 20,000-25,000 1,400 292-13/16"x123"x92-1/2"
ASC-60 25,000-30,000 1,400 298-13/16"x123"x107-1/2"
ASC-75 30,000-37,500 1,400 318-7/8"x123"x125-1/2"

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