Dedicated Outdoor Air Systems (DOAS)

Bolster Energy Efficiency via Innovative Petra and RenewAire DOAS Units

Petra Air to Air Heat Pumps for Space Heating
RenewAire Energy Recovery Ventilation

Our technologies are customized for each job. Contact us for specifications and more information:


DOAS Boosts Energy Efficiency

Commercial buildings require outside air whenever a space is occupied to meet ventilation standards and maintain indoor air quality. Incoming ventilation and make-up air typically account for more than 80% of a building’s dehumidification load. Hence, decoupling outdoor air demand and interior load demand via Dedicated Outdoor Air Systems (DOAS) allows systems to operate independently to optimize operational efficiency.

Petra DOAS PPH Air to Air Heat Pump for Space Heating
Petra DOAS unit

Benefits of DOAS for All Building Types

There are many reasons to use DOAS. Some of the most common drivers are:

  • Improved humidity control
  • Ability to use heating and cooling systems that don’t provide ventilation and/or dehumidification (e.g., radiant panels, chilled beams, VRF)
  • Reduced installation costs
  • Decreased energy consumption
  • Simplified ventilation design and control
RenewAire DOAS unit


About Petra

Petra was founded in 1987 with a broad vision to produce a wide variety of HVAC equipment for the global market. By 1994, Petra expanded its line of HVAC equipment utilizing some of the industries most advanced machinery, components and raw materials to achieve the highest quality and efficiency standards.

Petra offers a wide range of products, such as DOAS Units, Custom & Semicustom AHUs, Energy Recovery Units, Custom Chillers, CRAH/CRAC Units and more. Consequently, Petra established itself as a trusted manufacturer with an impressive list of clients worldwide, including within the U.S.

Petra DOAS
Petra is a global HVAC manufacturing leader

Petra Heat Recovery Dedicated Outdoor Air System (DOAS) PPH

Standard features:

  • 3,000 to 20,000 CFM
  • Dedicated outdoor air
  • Delivers neutral air to space for ventilation year-round
  • Cooling efficiency up to 19 EER
  • Heating efficiency up to 6.5 COP
  • Outdoor or indoor installation
  • Integrated microprocessor controller for stand-alone or BMS operation
  • Capacities ranging from 7.5-50 tons
  • Refrigeration cycle changes direction depending on heating or cooling mode
  • Able to accommodate unbalanced airflows
    Petra DOAS
    Petra Heat Recovery Dedicated Outdoor Air System (DOAS) PPH


    About RenewAire

    RenewAire has been a pioneer in Energy Recovery Ventilation technologies for over 35 years. Their Energy Recovery Ventilators (ERVs) improve people’s health, cognitive function, productivity and wellbeing by enhancing indoor air quality (IAQ) in homes and buildings of every type. This is done energy-efficiently, cost-effectively and sustainably via fifth-generation, static-plate, enthalpy-core ERVs and Dedicated Outdoor Air Systems (DOAS) that reuse otherwise-wasted energy to condition incoming outdoor air.

    RenewAire headquarters in Waunakee, WI

    RenewAire DOAS Overview

    • Available in 500 to 4,250 CFM
    • Enhanced indoor air quality (IAQ)
    • High sensible and latent energy recovery
    • Internal enthalpy-based bypass for 100% outdoor air (OA) economizer operation
    • 0% cross-contamination from exhaust airstream
    • No freezing concerns for the energy recovery core

    Available options:

    • Indoor or outdoor construction
    • 1” or 2” double-wall panel construction
    • Factory-mounted controls
    • Cooling options: split DX, chilled water, heat pump
    • Heating options: electric with SCR control, gas-fired with electronic modulation, hot water, steam and heat pump
    • Hot gas reheat
    • 2” or 4” MERV 8, 13 or 14 pleated media filters
    RenewAire DN Series DOAS With Integrated Refrigeration and Energy Recovery

    RenewAire DN Series DOAS

    • Split DOAS units with static-plate, total energy recovery
    • 375-4,950 CFM
    • Single-point connection, direct-drive EC fans, injected foam panels
    • Modular design

    RenewAire DN Series DOAS with Integrated Refrigeration

    • Split DOAS units with static-plate, total energy recovery
    • Integrated refrigeration
    • 375-4,950 CFM
    • Brushless DC compressors
    • EC motors on all fans
    • Modular design

    RenewAire RD Series DOAS

    • Commercial DOAS units with static-plate, total energy recovery
    • Bypass
    • Optional coils
    • 500-4,250 CFM

    Contact Us for More Information

    Our technologies are customized for each job. Contact us for specifications and more information.


    Let’s Work Together