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Make Up Air Heaters

2.5-4,500,000 BTU
Make Up Air Heating

The Safety Thaw Model 4500MA makeup air heater supports large projects that require highly reliable construction and makeup air heating. We provide an excellent commercial and industrial heating option with our 4,500,000 BTU firing rate. This heater can handle the most notable projects and provide complete temperature control during winter operations.


Generation Design

- F

field proven


continuous rated operation

4500MA 2023 V2
4500 Make UP Air Heater
4.5 Million Project Site
4500MA 2023 V2
4500 Make UP Air Heater
4.5 Million Project Site


  • Our makeup air system delivers forced mechanical ventilation to the project site, allowing treated air to circulate throughout it.
  • Our system raises the surface temperature of curing construction materials to speed up and optimize the curing process while still protecting quality
  • Manage site humidity by providing treated air; we can control site humidity with pressurization to speed up cure periods and limit the risk of mould.


  • Variable controller technology adjusts to the ambient temperature to provide consistent heat to the project while reducing fuel use.
  • Designed for reliability: We design for continual uptime since heating equipment must be ready to function in any scenario, from freezing weather to other challenging conditions.
  • Stainless Burner Head: Our modulating burner head allows you complete control. However, let's face it: the ambient temperature changes frequently, and the system must be prepared to respond.
Parameter Detail
Max Input BTU
4,500,000 BTU/HR
480V or 600V Versions
Fuel Gas Connection
2" NPT
Inlet Pressure Requirement
14" Water Column
Fuel Type
Natural Gas or Propane
Full Load Amps 480V
23 Amps @ 480V
Max Temperature
180 °F, 82°C
Blower Type
Forward Curved Centrifugal
Burner Management System
Airflow Rating
25,000 CFM @ 2" Back Pressure
130" x 71" x 71"
Product Compliance
ANSI Z83.7 / CSA 2.14


Our philosophy is to provide the greatest available solutions for our is about a never-ending commitment to improving our products to add value.

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