Temperature & Humidity Controlled Air Make Up Units

Precision Environmental Control for Aerospace, Defense & High-Spec Finishing

For aerospace, defense, and other specification-driven finishing operations, controlling temperature and humidity can be critical to consistently meeting coating specifications, OEM requirements, and production standards.

At Paintbooth.com, temperature- and humidity-controlled Air Make-Up Units (AMUs) are one of our specialties.

These are not standard heat-and-ventilation systems. They require careful coordination between the paint booth, Air Make-Up Unit, heating, cooling, dehumidification, filtration, exhaust, controls, sensors, and building conditions.

While many equipment suppliers focus primarily on standard heated AMUs, our team regularly designs and supports sophisticated environmental-control systems for demanding industrial finishing applications across the U.S.

Why Control Temperature & Humidity?

Many high-performance coatings have specific application requirements for air temperature, substrate temperature, relative humidity, flash-off, and cure conditions.

When those requirements fall within a narrow operating window, simply heating replacement air may not be enough.

A properly designed temperature- and humidity-controlled finishing system can help:

• Maintain consistent application conditions
• Improve coating consistency and film quality
• Reduce contamination and finish defects
• Support proper flash-off and curing
• Reduce rework, rejects, and production interruptions
• Maintain more repeatable conditions as outdoor weather changes
• Support demanding OEM, aerospace, defense, and industrial coating specifications

The objective is simple:

Create a controlled, repeatable finishing environment regardless of changing outdoor conditions.

More Than Heating the Air

Maintaining 70°F inside a paint booth is one thing.

Maintaining a specified temperature and relative humidity range throughout changing seasons and outdoor conditions is a much more demanding engineering challenge.

Depending on the application, an environmental-control system may incorporate:

• Direct-fired or indirect-fired heating
• Electric heating
• Mechanical cooling
• Chilled-water cooling coils
• Dehumidification
• Reheat
• Humidification where required
• Multi-stage filtration
• Temperature and humidity sensors
• Variable Frequency Drives (VFDs)
• Modulating controls
• PLC-based control systems
• Building pressure control
• Automated operating modes

The correct combination depends on the coating specification, geographic location, outside design conditions, production process, booth size, airflow requirements, and facility.

100% Outside Air vs. Recirculating Systems

Temperature- and humidity-controlled paint booths can be designed using different air-handling strategies depending on the application and applicable requirements.

100% Outside Air Systems

A 100% outside-air system brings fresh air into the system, conditions it, moves it through the paint booth, and exhausts the required air from the building.

Advantages can include:

• Straightforward air-handling strategy
• Fresh conditioned replacement air
• No return of booth process air through a recirculation loop
• Appropriate for applications where recirculation is restricted or unnecessary

The challenge is energy consumption.

Conditioning large volumes of outside air during hot, humid summers or cold winter conditions can require significant heating, cooling, and dehumidification capacity.

Recirculating Systems

Where permitted and properly engineered, a recirculating system can return a portion of the booth air through the air-handling system while maintaining the required amount of fresh outside air and exhaust.

Potential advantages include:

• Reduced outside-air conditioning load
• Improved energy efficiency
• Reduced heating and cooling demand
• More efficient temperature and humidity control
• Potentially lower operating costs

Because process air is being recirculated, these systems require additional engineering attention to filtration, controls, LEL monitoring, safety interlocks, coating characteristics, operating modes, and applicable code requirements.

Recirculation isn't simply an energy-saving option that can be added to any paint booth. It must be engineered as part of the complete finishing system.

Paintbooth.com — Engineered Finishing Environments for Demanding Applications.

📞 1-833-55-BOOTH

Filtration for Aerospace & Defense Applications

Filtration can be especially important in aerospace, defense, and other high-specification finishing environments.

Depending on the coating process and applicable requirements, Paintbooth.com can integrate multi-stage intake and exhaust filtration, including configurations designed to support applicable NESHAP requirements.

A properly designed filtration system helps protect both the finishing environment and downstream equipment while supporting consistent airflow as part of the complete system.

The Controls Are Just as Important as the HVAC Equipment

Heating, cooling, and dehumidification equipment alone don't create a controlled finishing environment.

The system needs to know what the conditions are and how to respond when they change.

Advanced systems can incorporate PLC-based controls that monitor and coordinate:

Temperature • Relative Humidity • Airflow • Booth Pressure • Heating • Cooling • Dehumidification • Exhaust • Filter Condition • Operating Modes • Safety Interlocks

Instead of operating as independent pieces of equipment, the booth, AMU, exhaust system, and environmental controls work together as one integrated finishing system.

Engineered Around Your Paint Specification

We don't believe in starting with an AMU and trying to make your process fit the equipment.

We start with the requirements of the finishing process.

That means evaluating:

• Required temperature range
• Required relative humidity range
• Coating manufacturer's specifications
• OEM finishing specifications
• Product dimensions
• Booth dimensions
• Required airflow
• Outside summer design conditions
• Outside winter design conditions
• Geographic location
• Production schedule
• Spray, flash, and cure requirements
• Filtration requirements
• Building conditions
• Available utilities
• Applicable codes and standards

From there, the environmental-control system can be engineered around the actual application.

High-Spec Finishing Requires High-Spec Environmental Control

Aerospace and defense coatings can represent a significant investment in materials, labor, production time, and finished components.

When coating performance depends on maintaining a narrow environmental window, temperature and humidity control should be considered part of the finishing process—not simply an HVAC option.

Paintbooth.com specializes in integrating the paint booth, Air Make-Up Unit, environmental controls, filtration, exhaust, and control system into one complete solution.

Have a Temperature or Humidity Specification You Need to Meet?

Send us your coating specifications, required temperature and relative humidity range, product dimensions, production requirements, and facility information.

Our team can evaluate the application and help determine the appropriate environmental-control strategy.

Paintbooth.com — Engineered Finishing Environments for Demanding Applications.

📞 1-833-55-BOOTH