MasterFormat 23 74 23 - Packaged, Outdoor, Heating-Only Makeup-Air Units

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MasterFormat Division 23 74 23: Packaged, Outdoor, Heating-Only Makeup-Air Units

MasterFormat Division 23 74 23 specifically covers packaged, outdoor, heating-only makeup-air units. These units are a vital part of many commercial and industrial HVAC systems, ensuring a constant flow of fresh, heated air into a building to replace exhausted air.

What is a Packaged, Outdoor, Heating-Only Makeup-Air Unit?

A packaged, outdoor, heating-only makeup-air unit is a self-contained HVAC system designed to draw in outdoor air, heat it, and deliver it into a building. Key features include:

Packaged: All components are pre-assembled in a single unit, simplifying installation.
Outdoor: Designed for outdoor installation, conserving valuable indoor space.
Heating-Only: Primarily focuses on heating the incoming air, though some units may offer basic filtration options.
Makeup-Air: Specifically replaces air exhausted from the building through ventilation, processes, or other means.

How Does a Packaged, Outdoor, Heating-Only Makeup-Air Unit Work?

The operation of a packaged, outdoor, heating-only makeup air unit follows these steps:

Air Intake: The unit draws in fresh outdoor air through an intake grille.
Heating: The air passes over a heating element, typically fueled by natural gas, propane, or electricity.
Supply Air: The heated air is delivered into the building through ductwork connected to the unit's supply outlet.
Controls: The unit's operation is managed by a control system, allowing for temperature adjustments and other settings.

Where is a Packaged, Outdoor, Heating-Only Makeup-Air Unit Commonly Used?

These units are commonly found in buildings with high ventilation requirements or processes generating significant exhaust air, such as:

Factories and manufacturing facilities
Warehouses and distribution centers
Commercial kitchens
Hospitals and laboratories
Automotive repair shops

What are Installation Best Practices for Packaged, Outdoor, Heating-Only Makeup-Air Units?

Proper installation is crucial for optimal performance and longevity:

Location: Select a level, structurally sound location with adequate clearance for airflow and maintenance access.
Foundation: Install a proper concrete pad or other suitable foundation to support the unit's weight.
Ductwork: Use appropriately sized and insulated ductwork to minimize pressure drop and heat loss.
Electrical and Gas Connections: Ensure all connections adhere to local codes and are performed by qualified professionals.
Commissioning: Have the unit professionally commissioned to ensure proper operation and settings.

What are the Top Manufacturers for Packaged, Outdoor, Heating-Only Makeup-Air Units?

Several reputable manufacturers specialize in these units, including:

Trane
Carrier
York
Greenheck
Daikin

Conclusion

Packaged, outdoor, heating-only makeup-air units, as classified under MasterFormat Division 23 74 23, are essential components of many commercial and industrial HVAC systems. Understanding their function, applications, and installation best practices is vital for ensuring a healthy and comfortable indoor environment while adhering to building codes and ventilation standards.

Packaged, Outdoor, Heating-Only Makeup-Air Units