Industries and Applications

To address the preservation challenges faced by museums and libraries due to increased molecular and particulate contamination, it's crucial to implement advanced air filtration strategies that align with the specific needs of these facilities.

Objective: To capture larger particulate matter and protect more sensitive filtration stages.

Specifications:

• Filter Efficiency: Utilize pre-filters with a Minimum Efficiency Reporting Value (MERV) of 8 or higher. MERV ratings are standardized by ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers), with MERV 8 filters effectively capturing dust, pollen, and other large particulates.
• Testing Standard: Ensure filters are tested according to ASHRAE Standard 52.2-2017, which provides a method for measuring the efficiency of air filters at system-rated airflow.

Implementation:

• Filter Placement: Install pre-filters in the HVAC system's return air ducts to capture large particles before they reach the main filtration stage.
• Maintenance: Regularly inspect and replace pre-filters to maintain efficiency and prevent overloading.

                        Objective: To reduce harmful gases and molecular contaminants that contribute to the degradation of sensitive materials.

Specifications:

• Media Bed Composition: Use filtration media specifically designed to target molecular contaminants, such as activated carbon, potassium permanganate, or specialty-treated carbon media. These can adsorb gases and volatile organic compounds (VOCs) that are detrimental to artifacts.
• Contaminant Focus: Ensure the media is effective against contaminants commonly found in indoor environments, including ozone, sulfur dioxide, formaldehyde, nitrogen dioxide, and other acidic gases.

Implementation:

• Filter Design: Incorporate molecular filtration systems in a way that complements the pre-filtration stage. The molecular filters should be sized and configured to handle the volume and types of contaminants present in the museum or library environment.
• Monitoring and Replacement: Regularly monitor the effectiveness of molecular filters through testing or sensor feedback. Replace the media according to manufacturer recommendations or based on performance data to maintain optimal air quality.

Objective: To remove particles between 0.3 micros and 1.0 with 98% efficiency. 

• Filter Efficiency: Install final filters with a Minimum Efficiency Reporting Value (MERV) of 15 or higher, as tested according to ASHRAE Standard 52.2-2017.
• Installation: Ensure proper installation of the filters according to the manufacturer's guidelines. A positively sealed filtration system will prevent unfiltered air bypass, maintain system pressure, and provide consistent filtration system efficiency. After each filter installation, the system must be checked to ensure that there are no possible leaks around the filters. This includes filter frames, fastening devices, caulking and gaskets. NAFA recommends having a NAFA Certified Air Filtration Specialist (CAFS) inspect the installation for system integrity at least annually.

                         Objective: To ensure overall system performance and the longevity of both filtration components and artifacts.

Specifications:

• System Compatibility: Ensure that the filtration technologies are compatible with the existing HVAC systems. This includes verifying that airflow and pressure requirements are met and that the system can handle the additional load.
• Regular Maintenance: Develop a comprehensive maintenance schedule that includes cleaning or replacing filters, checking for leaks or system malfunctions, and calibrating sensors and controls.

Implementation:

• Consultation: Consult one of our Certified Air Filter Specialists to tailor the filtration system to the specific needs of the museum or library.
• Record-Keeping: Maintain detailed records of filter changes, system performance, and air quality monitoring to track improvements and make data-driven decisions.

By integrating these filtration practices and maintaining the HVAC system, museums and libraries can significantly improve indoor air quality and better preserve their invaluable collections.