Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Units

MasterFormat Division 23 75 23: Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Units

MasterFormat Division 23 75 23 specifically addresses custom-packaged, outdoor, heating and ventilating makeup-air units. These units play a crucial role in maintaining indoor air quality and comfort in various commercial and industrial settings. This article delves into the intricacies of these units, covering their functionality, applications, installation practices, and leading manufacturers.

What is a Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Unit?

A custom-packaged, outdoor, heating and ventilating makeup-air unit, as the name suggests, is a pre-assembled system installed outdoors. Its primary function is to draw in fresh outdoor air, condition it (heating, cooling, filtering, and dehumidifying), and supply it to a building or space to replace exhausted air.

These units are "custom-packaged" because they are specifically designed and built to meet the unique requirements of a particular project. Factors considered during the design phase include the building's size, occupancy, ventilation needs, climate zone, and existing HVAC infrastructure.

How Does a Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Unit Work?

The operation of a custom-packaged makeup-air unit involves a series of steps:

1. Air Intake: The unit draws in fresh outdoor air through an intake grille or louver.
2. Filtration: The incoming air passes through filters to remove dust, pollen, and other airborne contaminants.
3. Heating/Cooling: Depending on the climate and indoor requirements, the air is either heated by a gas burner, hot water coil, or electric heater, or cooled by a direct-expansion (DX) cooling coil chilled by a refrigerant system.
4. Dehumidification (Optional): In humid climates, the unit might include a dehumidification section to remove excess moisture from the air.
5. Supply Air Delivery: The conditioned air is then distributed to the building through ductwork connected to the unit's supply air outlet.

Where is a Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Unit Commonly Used?

Custom-packaged, outdoor makeup-air units find applications in a wide range of commercial and industrial facilities, including:

• Manufacturing plants
• Warehouses
• Hospitals
• Schools and universities
• Commercial kitchens
• Shopping malls
• Office buildings

What are Installation Best Practices for Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Units?

Proper installation is crucial for the optimal performance, efficiency, and longevity of a custom-packaged makeup-air unit. Here are some best practices:

• Site Selection: Choose a location that provides adequate clearance for air intake and exhaust, is easily accessible for maintenance, and complies with local building codes.
• Foundation: Install the unit on a level and structurally sound foundation (concrete pad or rooftop curb) to prevent vibrations and ensure proper drainage.
• Ductwork Connections: Ensure all ductwork connections are airtight to prevent energy losses and maintain proper airflow.
• Electrical Connections: Hire a qualified electrician to make all electrical connections according to the manufacturer's specifications and local codes.
• Commissioning: After installation, have the unit commissioned by a certified technician to ensure it operates as intended and meets the design specifications.

What are the Top Manufacturers for Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Units?

Several reputable manufacturers specialize in custom-packaged makeup-air units. Some of the top names in the industry include:

• Trane
• Carrier
• York
• Daikin
• Greenheck
• Cambridge Air Solutions

Conclusion

Custom-packaged, outdoor, heating and ventilating makeup-air units are essential for maintaining a healthy and comfortable indoor environment in various commercial and industrial facilities. By understanding their functionality, applications, and installation best practices, building owners and managers can make informed decisions to ensure optimal indoor air quality and energy efficiency.