# Plan a building investigation and provider brief Lesson 1 of [Manage HVAC and indoor air quality projects](https://hvacpros.fyi/academy/manage-hvac-air-quality-projects.md), 10 minutes. A facility air-quality complaint needs a structured investigation rather than an immediate equipment purchase. EPA's Building Air Quality Guide, developed with the National Institute for Occupational Safety and Health, is aimed at owners and managers of public and commercial buildings. Its public overview describes building profiles, management plans, investigation, mitigation evaluation and deciding when outside technical specialists are needed. Use that framework to organize the buyer's work while leaving technical assessment to people with the relevant expertise. ## Establish the building context Start a brief that identifies the affected spaces, how they are used and the reported problem. The guide's public page lists a zone or room record, a pollutant and source inventory, a ventilation worksheet and HVAC checklists among its available forms. Those headings show why an investigation needs a picture of the building rather than only a list of replacement products. They do not provide a universal ventilation setting or a diagnosis you can apply without assessment. As a suggested management practice, gather existing system information and ask the provider what additional records would be useful. Mark unknown information clearly. Keep the occupant's description separate from a suspected cause. “An odor is reported in this meeting room” is an observation to investigate; “the air handler is contaminated” is a conclusion requiring evidence. This distinction helps you commission an investigation without telling the provider what answer it must reach. ## Preserve complaint information The guide overview identifies effective communication as part of preventing and resolving indoor-air problems. It lists a complaint form, incident log, occupant interview, occupant diary and a log of activities and system operation. You can use these categories to organize what people report and what was happening in the building. Agree who collects the information and who passes relevant observations to the investigator. Avoid losing the original description as the issue moves between a tenant, property manager and service company. Ask the provider to explain the purpose of each proposed investigation activity. The public overview describes an initial walkthrough, collecting additional information and forming and testing hypotheses. A hypothesis is a possible explanation to check, not an established finding. Ask what evidence would support it, what would challenge it and what remains uncertain. You are choosing an investigative approach that fits the need, not buying the appearance of certainty. ## Keep residential guidance in its scope EPA's home air-cleaner page explains that its residential technical guide does not address large or commercial structures such as offices or large apartment buildings. Do not turn a residential product recommendation into a facility design specification. Ask a provider to explain the basis for recommendations that fit the actual building and its use. Local requirements may also differ; ask the relevant authority about requirements for the project instead of importing a rule from another location. At the end of briefing, request a proposed investigation scope, its intended outputs and its limits. Include how findings and unresolved questions will be communicated. The EPA overview includes selecting professional assistance whose approach fits the need and evaluating whether mitigation has resolved the problem. Build those questions into procurement early. A specialist buyer's contribution is to preserve evidence and ask for a testable next step, so that later work can be judged against the original concern. ## Sources - https://www.epa.gov/indoor-air-quality-iaq/building-air-quality-guide-guide-building-owners-and-facility-managers - https://www.epa.gov/indoor-air-quality-iaq/air-cleaners-and-air-filters-home Also on the [web page](https://hvacpros.fyi/academy/manage-hvac-air-quality-projects/plan-a-building-investigation).