Installation Standards & Best Practices Flashcards

When replacing filters in a negative-pressure isolation room, what personal protective equipment (PPE) is minimally required by NAFA best practices?

Answer: At minimum, an N95 respirator, gloves, and eye protection

Spent filters contain concentrated biological and particulate contaminants; at minimum an N95 respirator, nitrile gloves, and eye protection protect the technician during changeout.

What is the NAFA-recommended procedure for removing a loaded filter to minimize particle re-entrainment into the airstream?

Answer: Shut down the fan before filter removal to prevent disturbed particles from entering the airstream

Shutting down the fan before removal prevents air velocity from re-entraining dislodged particles from the spent filter back into the duct or occupied space.

What installation practice ensures proper filter alignment in a multi-filter side-access housing?

Answer: Each filter must be aligned with its designated track and slid in until the front face is flush with the housing face

Each filter must be fully engaged in its correct track so that the filter face is flush with the housing face, ensuring proper gasket compression across all filters simultaneously.

Which ASHRAE standard provides performance and testing classification requirements that NAFA technicians must understand when selecting filters for installation?

Answer: ASHRAE 52.2

ASHRAE 52.2 defines the MERV (Minimum Efficiency Reporting Value) classification system used to rate filter efficiency across particle size ranges, which is the basis for filter selection.

What does a sudden significant increase in differential pressure across a newly installed clean filter most likely indicate?

Answer: An installation error such as a collapsed filter, blocked media, or wrong filter type installed

A clean filter should show resistance near its rated initial resistance; excessive pressure drop on a new filter suggests a structural problem, wrong specification, or blocked media face.

In a variable air volume (VAV) system, what installation consideration is critical when sizing filter banks?

Answer: Filters should be sized for maximum airflow to prevent excessive velocity at peak demand

Filter banks in VAV systems must be sized based on maximum design airflow to ensure face velocity stays within the filter's rated range during peak demand conditions.

What NAFA documentation practice is required after completing a filter installation or replacement?

Answer: A service record documenting the date, filter specifications, differential pressure readings, and technician name must be completed

Complete service records including date, installed filter specs, differential pressure readings, and technician identification enable tracking of filter life, system performance trends, and regulatory compliance.