Make Up Air Unit System Energy Efficient Heater

Make Up Air Unit - The M-Series By Cambridge

M-Series Make Up Air Units (MAUs) by Cambridge are on the cutting edge of Make Up Air technology and boast many unique features other Make Up Air Heaters on the market cannot duplicate.

Make Up Air is designed to “make up” air in your interior space when you have exhausted all that is available. This type of HVAC solution pulls in fresh, tempered air from outside your building to replace existing air that cannot be recirculated.

A Make Up Air solution is especially beneficial in buildings where environmental conditions warrant a greater need for ventilation not only to improve the quality of air within the building, but protect the health of those inside.

Our Make Up Air System is designed with reliability and year-round energy savings in mind, along with low costs for installation and maintenance. M-Series heaters include patented Cambridge Low-Fire Start Technology and proprietary stainless steel burners, and are specifically designed to provide year round ventilation and tempered make up air for a wide variety of demanding commercial and industrial applications.

A Cambridge Make Up Air Unit is also available with Variable Frequency Drive (VFD) control to respond to varying air needs in order to reduce operating costs.

Our units are also available with an optional cooling coil. For more information on this custom option please contact Cambridge Client Care.

Specs & Techs

Draw-Thru Make Up Air 

  • 100% Combustion Efficiency
  • Up to 6,500 MBH Capacity
  • Up to 75,000 CFM
  • Natural Gas or Propane

Cost Effective Tempered Make Up Air

  • Manufacturing and Assembly Plants
  • Restaurants and Commercial Kitchens
  • Wastewater Treatment Facilities
  • Automobile Service and Repair Facilities

What Kind of Heater Do I Need?

Make up air heaters are not efficient for some applications. Click here to determine best heater for your application.

Thinking About A Make Up Air System? Why and Where You Need Them

A Make Up Air System provides a cost effective way to utilize fresh, tempered air to replace building exhaust for both new and existing facilities.

The Cambridge M-Series Make Up Air System is designed for flexibility in installation, with several different mounting options available. You will find our units in a wide range of commercial applications, including:

  • manufacturing and assembly plants
  • foundries, paint booths
  • food processing plants
  • waste water and sewage treatment areas
  • automobile service and repair facilities
  • gymnasiums and indoor sports facilities
  • bakeries, restaurants and commercial kitchens
  • parking garages
  • and many other commercial/industrial facilities

A Make Up Air Heater is advised to be used in any size building with a process or operation that exhausts a large volume of air during the heating season. There is no limit as to when a Cambridge Make Up Air Unit can be installed in your building. The M-Series System can be installed in new construction projects, as part of a plant expansion, a renovation, as part of an HVAC upgrade or an energy-saving industrial retrofit.

What Makes Cambridge's Make Up Air Unit Better Than Other Units?

Cambridge Engineering truly believes the M-Series is the top solution on the marketplace today, and we boast the case studies to back it up – with installations in thousands of buildings nationwide.

Our Make Up Air System comes complete with a variety of performance-enhancing features such as:

  • Several cooling options – including DX or Chilled Water Coils and Evaporative Cooling
  • Motorized inlet or Discharge Damper
  • Single or Dual Rain Hood Inlet options, V-Bank Filter Sections & High Efficiency Filters
  • Multiple Discharge Options
  • A wide variety of control options
  • Patented Low-Fire Start Technology to increase reliability and save energy
  • Proprietary Stainless Steel Burners

From the factory, our Make Up Air Heaters come with reliable components designed to promote a long life and continued energy savings including:

  • Shielded and ventilated motor assembly
  • Low voltage hot surface igniter
  • Closed cell, non-water absorbing insulation in the base to eliminate condensation issues
  • High-temperature limit switch, airflow switch and gas modulation control

Warranty on our Make Up Air System

Cambridge offers the industry’s best warranty on Make Up Air Units – guaranteeing our heaters for 2 years and our stainless steel burners for 5 years.

Setting the Standard for Safety in Make Up Air

Cambridge was the first manufacturer to have its Make Up Air Heater tested and certified to the industry’s harmonized joint US/Canadian standard for non-recirculating direct gas fired industrial air heaters.

Rundown of M-Series Make Up Air Unit Features

  • More heat, less energy and better indoor air quality
  • Proprietary high efficiency, stainless steel burner
  • 100% fresh outside air
  • Shielded and ventilated motor assembly extends motor life
  • The industry's best warranty package includes 2 years on the heater and 5 years on the stainless Cambridge burner
  • External profile damper adjustment and built-in pressure gauge reduce start-up time and ensure optimal burner performance
  • Installation flexibility with rooftop, thru-wall, under roof, pad mount and indoor or outdoor vertical mounting options

See All Features & Benefits

Make Up Air System Mounting Options

The M-Series is designed to be the most flexible Make Up Air System on the market, with four distinct mounting options available.

Rooftop Installation

         Make Up Air System Heater For Rooftop

The rooftop horizontal mount configuration utilizes dual rain hoods and an inlet screen, allowing fresh air to enter and circulate downward, while keeping rainwater out of the system.


Thru Wall Installation

Make Up Air System Heater Thru Wall

Thru Wall Installations are ideal for automotive service areas, or any other factory application allowing fresh air to run straight through the system. This mounting type utilizes a single rain hood, and runs through building flashing & trim.


Pad Mount Installation

Make Up Air System Heater Pad Mount Installation

A pad mount installation pulls in air from ground-level, sitting above grade, running fresh air through the discharge elbow in through the side of your building. This Make Up Air unit features dual rain hoods with an inlet screen.


Outdoor Vertical Installation

Make Up Air System Heater for Outdoor Vertical Installation

Fresh air enters through the bottom of the unit and is fed into the building through a discharge duct along the unit itself.


Get the Very Best for Your Building – Install a Cambridge M-Series Make Up Air System

Improving the functionality of your building with fresh, tempered make up air while decreasing your energy consumption – that’s a smart decision.

Cambridge Engineering is ready to speak with you to develop a customized Make Up Air solution for your building project.

Schedule an Appointment or a Lunch and Learn today to learn more about our innovative Make Up Air System, or contact our Customer Care Division at 1-888-919-4779 today to get started.