Indoor Indirect Fired Separated Combustion Make-Up Air

MS Series are designed to be installed in dusty, dirty and mildly corrosive environments or where local codes require outside air to be used for combustion.

Sterling MS Series separated combustion indoor make-up air systems are similar to the ME unit except a separated combustion type duct furnace is utilized. Separated combustion units are designed to be installed in dusty, dirty and mildly corrosive environments or where local codes require outside air to be used for combustion. Heating capacities range from 100 to 1,200 MBH with airflows from 900 to 14,800 CFM.

Standard Features

  • 100 - 1,200 MBH
  • 80% Thermal Efficiency
  • ETL Certified Indoor Duct Furnaces.
  • Packaged Units, designed to UL-1995 Standards.
  • Heating Capacities from 100 MBH - 1,200 MBH. (29.3 kW - 351.4 kW)
  • Power Vented and Separated Combustion Furnaces
  • Power Vented Furnace Temperature Rise 30-80 °F (17-44 °C) per Furnace
  • Separated Combustion Furnace Temperature Rise 20-90 °F(11-50 °C) per Furnace.
  • CFM Ranges from 800 - 14,000 CFM (0.4 — 6.6 Cu. m/s)
  • Motor Sizes up to 15 Horse Power (EPACT compliant)
  • Standard ODP Motors; with Premium Efficiency and Totally Enclosed optional
  • Standard Right Side Service Access, Left Optional

Packaged Air, Heating and Cooling System

The Sterling Indoor Make-Up Air Unit is a packaged air, heating and cooling system, suitable for heating, cooling,
ventilating and makeup air applications. Unit sizes range from 800 to 14,000 CFM (0.4-6.6 cu. m/s) with 1/2-15 HP.
motors and 100,000 BTU/H to 1,200,000 BTU/H (29.3 to 351.4 kW) input. Duct furnaces are ETL certified for safety and performance, with a range of 100,000 to 400,000 BTU/H (29.3 to 117.1 kW) input per duct furnace. Packaged units are also designed to be in compliance with “UL-1995” Standard for HVAC Equipment. Sterling Indoor units may be ordered with DX or Chilled Water Cooling, Evaporative Cooling or Packaged Heating and Cooling Systems.


    All the Literature associated with the MS Series


    For additional items browse the full Literature library at the link below.


    Performance, Materials and Features for each MS Series capacity model.


    Standard (min)

    standard (max

    MBH Input100 MBH1,200 MBH
    MBH Output80 MBH960 MBH
    Thermal Efficiency80%80%
    Min CFM800 CFM800 CFM
    Max CFM14,000 MBH14,000 MBH


    The MS Series is quite versitile it can be installed in a variety of applications. Here are a few key ways The MS Series can make your space more comfortable.

    Related Products

    Since your interested in the MS Series you may also be interested in these products.


    AH Series

    Air Handlers Engineered Products Rooftop Equipment 1,500 - 15,000 CFM
    Read More
    Model EV


    Evaporative Coolers Engineered Products Rooftop Equipment 8,500 CFM
    Read More
    ME Unit

    ME Series

    Indoor Indirect Fired Make-Up Air Engineered Products Indoor Make-Up Air 100 - 1,200 MBH
    80% Thermal Efficiency
    Read More
    Model QVED-QVES


    Power Vented Engineered Products Indoor Duct Furnaces 100 - 400 MBH
    80% Thermal Efficiency
    Read More
    MODEL RT-Duct Furnace

    RT & PV

    Outdoor Gravity and Power Vented Indirect Fired Make-Up Air Engineered Products Rooftop Equipment 100 - 1,200 MBH
    Read More

    Are you looking for a

    Sales Representative?

    Find your local sales office right now!

    We use cookies to improve user experience and analyze website traffic. Read about how we use cookies and how you can control them by clicking "Privacy Preferences".

    Privacy Preferences I Agree

    Privacy Preferences

    When you visit any website, it may store or retrieve information through your browser, usually in the form of cookies. Since we respect your right to privacy, you can choose not to permit data collection from certain types of services. However, not allowing these services may impact your experience.