Sierra Fresh Air Systems
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Sierra Products



DOAS Split System - Model ZFR

ZFR Product Details

  • Dedicated Outside Air System
  • Rooftop AHU with dehumidification, heating, and filtration
  • Utilizes external DX or CW cooling source
  • Integral indirect-fired heating with DHTD (patent(s) pending)
  • Includes Patented AdaptAire™ DDC controls, integrates with most building control systems
The ZFR delivers high quality outside ventilation air for comfort and Indoor Air Quality in commercial buildings, with dehumidification, heating and filtration (up to MERV15) in a split system configuration. The ZFR allows engineers to satisfy load requirements more efficiently with higher ventilation rates while permitting conventional HVAC equipment to operate as originally designed.
DOAS Integral Package Unit - Model DCV

DCV Product Details

  • Dedicated Outside Air System
  • Rooftop AHU with integral cooling, heating and filtration
  • Built-in DX condensing unit
  • Integral indirect-fired heating with DHTD (patent(s) pending)
  • Includes Patented AdaptAire™ DDC controls, integrates with most building control systems
The new Sierra DCV is the most cost-effective way to provide cooling, heating and high-efficiency filtration (up to MERV15) of outside air for commercial building ventilation in a packaged unit. The DCV is the only packaged DOAS unit that delivers full ASHRAE 62.1 compliance, and up to 6 LEED points in a single product!
EVAP Evaporative Cooling System - Model ZEC

ZEC Product Details

  • Heavy duty single-stage evaporative cooling
  • Ideal for laundries and restaurants
  • Up to 80% saturation efficiency
  • Low Operating and Maintenance Costs
The ZEC evaporative cooling system is one of the most environmentally friendly ways to improve working conditions and productivity. Evaporative systems can cool at 20% the cost of mechanical air conditioning. The innovative Turbo-CEL™ evaporative cooling media provides efficient cooling using water, not refrigerants, reducing your carbon footprint. Capacities up to 64,000 CFM are available.
EVAP Indirect/Direct Evaporative Cooling System - Model Aztec

AZTEC Product Details

  • 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.

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