Read HVAC Plans, Registers, Returns, and Equipment Notes

A. Finished-Package Specification

Deliverable set: one equipment register covering every furnace, air handler, condensing unit, heat pump, boiler, mini-split, ERV/HRV, fan, pump, and humidifier shown; one supply/return/exhaust outlet register covering every register, diffuser, grille, and inlet; one duct and piping route summary distinguishing diagrammatic from coordinated routing; one condensate and control record; and one HVAC layout checklist organized by equipment, supply, return, exhaust, ventilation, duct route, piping, condensate, controls, support, access, test, and inspection, with an unresolved-item log.

B. Deliverable Schedule (Component Schedule)

Component	Quantity	Source	Required Fields	Preparation / Purpose
Equipment register	1	Mechanical plans, schedules, approved submittals	Tag, type, location, orientation, access, clearance, schedule reference, status	Confirms every piece of equipment is identified and matched to its schedule
Outlet register	1	Mechanical plans and schedules	Tag, type, room, mounting, size, direction, control reference, status	Confirms every supply, return, transfer, and exhaust outlet is identified and matched
Duct and piping route summary	1	Mechanical plans, details, sections	System, route description, sizes/elevations where shown, diagrammatic or coordinated status	Distinguishes field-ready routing from routing requiring further coordination
Condensate and control record	1	Mechanical plans, details, control diagrams	Source, route, discharge point, thermostat/sensor/zoning location, control reference	Confirms condensate and control information is documented and traceable
HVAC layout checklist	1	All of the above plus cross-trade comparison	Item, source reference, cross-trade comparison result, inspection/test hold point, status	Converts the registers and route summary into a build-oriented checklist

C. Source Material Takeoff

• Primary source: the current mechanical/HVAC plans, legends, schedules, load or design summaries where issued, details, controls documents, and specifications available for the project at the time this chapter begins.
• Supporting source: architectural, structural, plumbing, and electrical plans needed to cross-check equipment, register, duct, and pipe locations, and any approved equipment submittals.
• Reference tools: one engineer's or architect's scale, one straightedge, and a consistent set of markup colors.
• Recording medium: one document-control log or spreadsheet capable of holding all five deliverable components listed in Section B.

D. Acceptance Standards

Check	Standard
Equipment register completeness	Every piece of equipment shown on the mechanical plans appears in the register and is matched to a schedule entry, or is logged as missing/unmatched
Outlet register completeness	Every supply, return, transfer, and exhaust outlet shown on the plans appears in the register and is matched to a schedule entry, or is logged as missing/unmatched
Routing status accuracy	Every duct and pipe route in the route summary is marked diagrammatic or coordinated, and no diagrammatic route is treated as a field-ready dimension
Termination resolution	Every duct, vent, and exhaust termination is traced to a real exterior point or logged as unresolved
Cross-trade comparison	Every checklist item affecting framing, ceilings, cabinets, or other trades has a recorded comparison result and, where needed, a logged conflict
Unresolved-item capture	Every missing tag, unclear route, unclear termination, or unresolved conflict encountered while building the package is recorded, not silently resolved

E. Preparation — Confirm Documents and Systems Included

1. Confirm current mechanical or HVAC plans, legends, schedules, load or design summaries where issued, details, controls, specifications, and approved equipment information. Enter the confirmed issue directly on the Project and Document Identity Record.
2. Identify heating, cooling, ventilation, exhaust, combustion-air, make-up-air, humidification, dehumidification, filtration, and specialty systems included. Record which systems are present and which are explicitly excluded from this project.

F. Equipment Register Construction

1. Locate furnaces, air handlers, heat pumps, condensing units, boilers, mini-splits, ERVs, HRVs, fans, pumps, humidifiers, and other equipment. Add one row per equipment item to the equipment register.
2. Match equipment tags to schedules, notes, details, specifications, and approved submittals. Confirm each tag has a corresponding schedule entry; log any unmatched tag or schedule entry.
3. Record equipment location, orientation, access, service clearances, support, vibration, drain, electrical, fuel, vent, and control references as documented. Populate these fields directly from the plans, schedules, and details — do not estimate a clearance the documents do not state.

G. Outlet Register Construction

1. Locate supply registers, diffusers, grilles, return grilles, transfer grilles, and exhaust inlets. Add one row per outlet to the outlet register.
2. Match outlet and inlet tags to schedules and air-quantity information where provided. Confirm each tag has a corresponding schedule entry; log any unmatched tag.
3. Identify mounting location, size, direction, pattern, finish, and control references where documented. Populate these fields directly from the schedules and reflected ceiling or floor plan notes.

H. Duct and Piping Route Summary

1. Trace main trunks, branches, risers, chases, shafts, plenums, flex connections, and terminal routes shown. Record each route in the route summary by system and description.
2. Distinguish diagrammatic duct routing from fully coordinated routing. Mark each route as diagrammatic or coordinated based on what the documents state.
3. Identify duct sizes, elevations, insulation, lining, support, sealing, and pressure-class references where documented. Record only values the documents actually state.
4. Locate outdoor-air intakes, exhaust terminations, combustion air, relief openings, and prohibited proximity relationships shown. Add these to the route summary with their exterior termination points.
5. Identify bath, kitchen, laundry, dryer, range, appliance, and whole-house ventilation routes. Confirm each ventilation route has a documented termination.
6. Compare ventilation terminations with roof, wall, window, door, property-line, and outdoor-equipment information. Cross-check each termination against the exterior elevations and roof plan from Chapters 5 and 14.
7. Identify refrigerant, hydronic, fuel-gas, control, and electrical routes shown. Record these routes without inferring pipe size, charge, combustion, or control logic not provided by the documents.

I. Condensate and Control Record

1. Locate condensate drains, traps, pumps, pans, overflow paths, and discharge points. Record each in the condensate and control record.
2. Compare condensate routes with plumbing, ceilings, cabinets, floor drains, and exterior discharge. Cross-check against the Chapter 11 plumbing fixture register.
3. Locate thermostats, sensors, zoning controls, dampers, access panels, disconnects, and service switches. Record each with its plan location and control reference.
4. Compare control locations with doors, windows, sunlight, appliances, supply air, cabinets, and occupant access. Note any apparent conflict for the layout checklist.

J. Cross-Trade Comparison

1. Compare ducts and equipment with joists, trusses, beams, posts, headers, stairs, soffits, ceiling heights, and attic access. Use the Chapter 7 structural framing checklist as the comparison reference.
2. Identify structural openings, framed chases, roof curbs, sleeves, blocking, and equipment supports requiring coordination. Record each on the layout checklist with its cross-reference.
3. Do not authorize field cutting of structural members to fit ducts or equipment. Log any apparent conflict as a clarification item instead.
4. Identify fire, smoke, draft, acoustic, air-sealing, insulation, and penetration-protection requirements. Record these from the specifications and details reviewed in Chapter 16 where already available, or flag for that chapter.

K. Layout Checklist Assembly and Closeout

1. Identify balancing, startup, testing, commissioning, filter, labeling, and owner-training requirements. Add these as inspection and closeout items on the layout checklist.
2. Identify owner-furnished, contractor-furnished, delegated-design, factory-startup, and work-by-others responsibilities. Record each responsibility only as the documents state it.
3. Identify missing outlet tags, route conflicts, inaccessible filters, inadequate service space, or unresolved termination locations. Consolidate these into the unresolved-item log.
4. Create an HVAC layout checklist organized by equipment, supply, return, exhaust, ventilation, duct route, piping, condensate, controls, support, access, test, and inspection. Build the checklist from the equipment register, outlet register, route summary, and condensate and control record.
5. Attach sheet, schedule, detail, specification, submittal, control diagram, and manufacturer references. Add a reference column to every checklist row.
6. Prepare RFI-style questions for conflicts, missing sizes, unclear routes, inaccessible equipment, structural interference, or incomplete discharge information. Draft one neutral question per unresolved item.
7. Review the checklist against architectural, structural, plumbing, electrical, roof, ceiling, and cabinet documents. Confirm every cross-trade comparison in Section J has a recorded result before closing the chapter.