According to reference information, Alabama has specific climatic and regulatory requirements for building ventilation system design, 

which provides a foundation for the application of ERV (Energy Recovery Ventilation) systems.

The following are key considerations and scenarios suitable for installing ERV systems:

Climatic Conditions and Ventilation Needs

Alabama, located in the southeastern United States, has a warm and humid climate with hot, humid summers and mild winters. This climate characteristic necessitates effective 

ventilation to improve indoor air quality during transitional seasons and summer (outdoor dry-bulb temperatures of 12-28°C), while simultaneously controlling humidity. ERV systems, 

by recovering energy (such as heat and humidity) from exhaust air, reduce energy consumption when introducing fresh air, making them ideal for these climatic conditions.

Applicable Building Types

Large Public Buildings

According to the "Technical Specification for Natural Ventilation Application in Large Public Buildings," densely populated buildings (such as shopping malls and schools) 

and large-space buildings (such as stadiums and exhibition halls) require integrated ventilation system design. ERV systems can be used in conjunction with natural ventilation to 

provide a stable and energy-efficient mechanical ventilation solution when natural ventilation cannot be fully relied upon.

Multifamily Homes and Passive Houses

For multifamily home projects, centralized ERV systems can serve multiple floors, connected via vertical ducting, reducing footprint and improving efficiency. In Alabama's hot and humid environment, 

ERVs effectively balance ventilation and energy consumption, enhancing living comfort.

Design Codes and Energy Efficiency Requirements

Alabama requires compliance with the Clean Air Act and related state air quality management plans; ventilation system designs must meet environmental requirements.

New buildings using mechanical ventilation (such as ERVs) must be designed, constructed, and inspected concurrently with the building design, and must meet renewable energy usage requirements 

(e.g., no less than 10% of total energy consumption).

Real-world Case Studies

While the reference information does not directly mention ERV projects in Alabama, similar climate regions (such as Georgia) have optimized ventilation rules by revising their State Implementation Plans, 

removing outdated emission declaration requirements to support the application of efficient ventilation technologies. This indicates policy support for energy-efficient ventilation systems in these regions.

Recommendations

When promoting ERV systems in Alabama, local climate data (such as temperature, humidity, and wind speed) and building function should be considered, prioritizing application in the following scenarios:

High humidity areas: such as coastal cities (e.g., Mobile), where indoor humidity control is crucial.

Densely populated areas: such as schools and hospitals, where air quality must be ensured.

Energy-saving retrofit projects: When upgrading existing buildings, integrating renewable energy sources such as photovoltaic systems can improve overall energy efficiency.

For specific design parameters, it is recommended to refer to ASHRAE standards or consult a local HVAC engineer to ensure system compatibility with the building structure.