Make Up Air Unit System Energy Efficient Heater

M-Series Make Up Air Unit - An Overview

Cambridge's line of competitively priced Make Up Air Systems has many unique features that reduce installation costs, increase reliability and save energy. All M-Series make up air heaters include patented Cambridge Low-Fire Start Technology and proprietary stainless steel burners. The M-Series is designed to provide year round ventilation and tempered make up air for a wide variety of demanding commercial and industrial applications. It is also available with Variable Frequency Drive (VFD) control to respond to varying air needs in order to reduce operating costs.

Specs & Techs

Draw-Thru Make Up Air 

  • 100% Combustion Efficiency
  • Up to 8,000 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.

M-Series Make Up Air Unit Applications

Cost effective way to provide fresh, tempered make up air to replace building exhaust from both new and existing facilities 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.

Building Size: Any size building with a process or operation that exhausts a large volume of air during the heating season creates the need for energy efficient, M-Series, direct gas-fired make up air solutions.

Projects: New construction, plant expansions, rehab projects, HVAC upgrades and energy saving retrofits.




  • 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

Mounting Options

Rooftop Installation

         Make Up Air System Heater For Rooftop

Thru Wall Installation

Make Up Air System Heater Thru Wall

Pad Mount Installation

Make Up Air System Heater Pad Mount Installation

Outdoor Vertical Installation

Make Up Air System Heater for Outdoor Vertical Installation