Trace the air system through duct routes, rated construction, damper schedules, access details, and control descriptions. Groundbook can investigate conflicting document information using the applicable uploaded NFPA 90A reference. The designers determine which protective arrangements are required.
What does NFPA 90A cover?
NFPA 90A is the Standard for the Installation of Air-Conditioning and Ventilating Systems. NFPA describes a scope addressing air-conditioning and ventilating systems, including ducts, filters, and related equipment, with attention to fire, smoke, and gases.
NFPA’s official NFPA 90A page identifies the 2027 edition as current when checked on September 30, 2026. Confirm the edition, local amendments, and project scope that actually govern the work. The publisher’s newest edition does not establish local adoption.
Confirm the project’s applicable system scope and referenced requirements. Do not classify every HVAC shutdown sequence as a smoke-control system. The fire alarm interface review helps connect stated initiating signals and mechanical responses without assuming the response that the design must use.
Collect ducts, barriers, devices, and sequences
Gather mechanical plans and schematics, equipment and damper schedules, architectural rated wall and floor plans, shaft sections, access details, controls specifications, and the relevant alarm sequence. Include device data and installation information where available.
Identify duct and equipment tags and follow their routes across levels. A damper symbol on a schematic may not show the access arrangement or exact receiving construction. Preserve that distinction when deciding whether the supplied package establishes the physical interface.
Review the HVAC protection interfaces
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Air system identity | Equipment schedule, duct plans, schematic, controls documents | Resolve renamed equipment and inconsistent descriptions before tracing its response. |
| Barrier crossings | Duct route, rated plans, shaft and wall sections | Identify which receiving constructions the route crosses and ask for missing details. |
| Damper references | Symbols, schedule, details, supplied product information | Reconcile type and location descriptions for the same device. |
| Service access | Damper detail, ceiling plan, access panel, adjacent equipment | Check whether drawings explain how the relevant device can be reached. |
| Control behavior | Mechanical sequence, alarm matrix, device assignments | Ask both designers to resolve contradictory signals or responses. |
| Changed routes | Current mechanical issue and architectural barrier revision | Backcheck protective and access references affected by a route change. |
The HVAC controls guide follows written sequences, while the shaft and opening checklist helps carry the route through architecture and structure. Where the same fans and dampers also serve a smoke control system, compare the narrative and zones with the NFPA 92 smoke control guide.
Example: a damper moved but its access panel did not
Hypothetical example. The revised duct plan moves a scheduled damper into a shaft, but the architectural access panel remains in its earlier corridor position. No current section shows how the moved device can be reached.
The mechanical revision relocates this damper while the access-panel plan retains the previous location. Please confirm the receiving construction and access arrangement, then coordinate the damper and architectural details.
The designers establish the intended location, protection, and access method. Backcheck the duct route, damper schedule, relevant section, and access-panel documents. The conflict identifies an unresolved interface rather than a measured access failure.
Review HVAC fire interfaces with Groundbook
Upload the current project PDFs and relevant specifications to Groundbook. Identify the governing issues and add the applicable NFPA 90A reference from a copy you are licensed to use, where the license permits uploading it. State the edition, amendments, review area, and known exclusions in your instructions.
Compare HVAC routes and device schedules with rated construction, access details, controls, and fire alarm sequences. Flag inconsistent damper identifiers, receiving details, and stated responses. Cite both sources and the applicable supplied NFPA 90A reference.
Verify the actual route and system identity before accepting a source-linked finding. Assign mechanical, architectural, and controls questions together where one response affects the others. Follow the revised condition into all dependent schedules.
Document review does not establish which dampers are required, validate smoke-control performance, or prove device operation. Technical applicability, design analysis, inspection, and testing require the appropriate professionals.