NOTE This standard governs the complete door slab from selection through factory fabrication, site delivery, installation, and acceptance. (1.4)

NOTE Flush wood doors are an assembly product: the slab performance the Owner pays for is delivered only when the frame, the hardware, and the wall opening are coordinated with the leaf; this standard fixes the leaf and depends on the companion standards named below to complete the rated, acoustic, or operational assembly. (1.5)

NOTE The door frame, hollow metal and wood bucks, and door hardware are excluded and are coordinated under Doors Frames And HardwareDoors, Frames, and HardwareResolves to the current edition.sync/doors-frames-and-hardware. (1.6)

NOTE A flush wood leaf installed in a non-rated or mis-listed frame voids the fire-door listing of the whole assembly; the frame and hardware are specified together with the steel-door assembly so that label, clearances, and preparations are reconciled in one schedule. (1.7)

NOTE Fire-rated glazing inserts, vision lites, and borrowed-light sidelites are excluded and are covered under Fire Rated GlazingFire-Rated Glazing and FramingResolves to the current edition.sync/fire-rated-glazing. (1.8)

NOTE The lite kit, its glazing, and the glazing stops carry their own fire test and label; this standard sizes and locates the cutout in the leaf and coordinates the labeled lite kit, but the glazing product itself is specified elsewhere. (1.9)

NOTE Stile-and-rail wood doors, including panel, French, and louvered doors, are a distinct product type and are excluded. (1.10)

NOTE Stile-and-rail construction is governed by ANSI/WDMA I.S.6A and uses different joinery, grading, and fire-listing rules; only flush-panel construction is covered here. (1.11)

NOTE Overhead coiling and rolling doors are excluded and are covered under Overhead Coiling DoorsOverhead Coiling DoorsResolves to the current edition.sync/overhead-coiling-doors. (1.12)

NOTE Casing, jamb trim, and finish carpentry at door openings are excluded and are covered under Finish CarpentryFinish CarpentryResolves to the current edition.sync/finish-carpentry. (1.13)

NOTE A labeled fire door carries the edition of UL 10C, NFPA 80, and the IBC in force when it was tested and listed; specifying a later edition of NFPA 80 does not re-qualify an older label — the listing edition governs the door, and the adopted code edition governs the project requirement for what rating must be present. (2.4)

NOTE Single-source responsibility keeps veneer flitches, core specifications, and finish systems consistent across the project and gives the Owner one party to hold to the warranty; mixing manufacturers within a transparent-finish door set is a frequent cause of visible grain and color mismatch. (4.2)

NOTE WDMA duty levels (Heavy, Standard, Economy) and AWI Quality Grades (Premium, Custom, Economy) are not interchangeable shorthand; AWI Premium Grade flush doors cost two to four times Custom Grade, and specifying Premium without confirming budget is a common over-specification — for most commercial work the project default is AWI Custom Grade solid-core, and for healthcare and education that grade is the baseline minimum. (4.5)

NOTE The label certifies that the specific door, as built, passed the referenced fire test; a field-applied or transferred label has no test behind it and is grounds for rejection by the AHJ, and field cutting or boring of a labeled door beyond the manufacturer's listed tolerances likewise voids the label, per NFPA 80. (4.8)

NOTE Most jurisdictions adopting recent IBC editions require positive-pressure fire-test listing; a door listed only to the older neutral-pressure protocol may be rejected, and confirming the required protocol during submittals avoids a late re-order of the entire rated-door package. (4.10)

NOTE Wood doors are dimensionally sensitive to moisture; installing before the building is weathertight and conditioned invites cupping, warp, telegraphing, and adhesive failure that no warranty covers, and sustained interior relative humidity outside roughly 25% to 55% is the most common cause of field warp claims. (5.2)

NOTE Hollow-core construction has no continuous core behind the face and offers little screw-holding, impact resistance, or acoustic mass; it is appropriate only for light-duty residential, closet, and similar low-abuse openings, and substituting hollow-core to save cost at an abusive opening produces early failure. (5.5)

NOTE A standard interior flush door used at an exterior opening delaminates; exterior service requires an exterior-grade adhesive bond, a weather-resistant face, and a leaf tested for water resistance — these are a distinct product, not a field upgrade of an interior door. (5.7)

NOTE "Solid core" spans particleboard, stave (glued block) lumber, structural composite lumber, MDF, agrifiber, and fire-resistant composite cores, each with different weight, screw-holding, acoustic mass, and cost; a manufacturer asked only for "solid core" will supply the lowest-cost compliant core, which may not deliver the intended STC or hardware pull-out. (6.2)

NOTE The 1-3/4 in. leaf is the default for all commercial interior flush doors; the 1-3/8 in. leaf is reserved for light-duty residential and closet openings, and fire-rated leaves must match the labeled assembly thickness exactly since a thickness change re-opens the listing. (6.6)

NOTE Manufacturer flat-warp warranties typically cover leaves up to about 3'-6" by 10'-0" and pairs up to 7'-0" combined width; oversized custom doors need engineered cores and are non-stock, and confirming the warranty limit before specifying avoids an unenforceable warranty on the largest, costliest leaves. (6.10)

NOTE Omitting species, cut (rotary, plain-sliced, quarter-sliced), or match is a leading cause of substitution disputes and mismatched door sets, because the manufacturer will otherwise supply the most economical compliant veneer; the three together define the appearance and none can be left implied. (7.2)

NOTE HPVA face grades run from Grade A (virtually defect-free) through Grade B and Grade C to Backing grade; Grade A is the premium transparent-finish default, lower grades admit more color and figure variation, and face grade is referenced within both WDMA I.S.1A and AWI/AWS so it travels with the quality grade. (7.4)

NOTE Pair and set matching (balance match, center-balance match, or running match across leaves) governs how grain reads across adjacent leaves of one opening; specifying a within-leaf match without also specifying the across-leaf panel match leaves pairs visibly mismatched. (7.9)

NOTE Edges may be solid wood (stile-applied or applied band), HPL-banded to match an HPL face, or MDF for opaque doors; solid wood edges on veneer doors allow site trimming and refinishing, HPL edges resist abrasion, and the edge type must suit both the face and the amount of field fitting expected. (7.13)

NOTE IBC Table 716.1 (and the corresponding NFPA 101 provisions) set the required opening-protective rating from the rated wall and occupancy: roughly 20-minute at corridor walls, 3/4-hour (45-minute) at 1-hour-rated walls, 1-hour at certain separations, and 1-1/2-hour at 2-hour walls; flush wood doors are commonly used at 45-minute and below, and specifying the wrong rating is a frequent design-phase error. (8.2)

NOTE For 20-minute and 45-minute labels, listings commonly permit up to 100 in² of rated vision glazing per leaf; 60-minute and 90-minute ratings restrict or eliminate lites unless special listed glazing is used per IBC Section 716, and the lite kit and glazing themselves are specified under Fire Rated GlazingFire-Rated Glazing and FramingResolves to the current edition.sync/fire-rated-glazing — this standard only sizes and locates the cutout in the leaf. (8.4)

NOTE NFPA 80 permits only limited field preparation of labeled doors; boring, mortising, or trimming a rated leaf beyond the manufacturer's listed job-site tolerances voids the label, and all locksets, closers, viewers, and electrical preps must be factory-machined to match the hardware schedule. (8.7)

NOTE The published STC of a door is meaningless without the full perimeter seal; a standard solid-core slab reaches roughly STC 28 to 32, but the installed assembly only performs when perimeter gasketing, an automatic drop seal at the bottom, and a sealed threshold are provided, and hollow-core doors reach only about STC 20 to 25 and cannot be made acoustic by sealing. (9.2)

NOTE Factory finishing (catalytic lacquer, conversion varnish, or UV-cured systems) is increasingly the institutional norm because it removes field-finishing odor, schedule, and quality-control risk; for healthcare and education complete factory finish is the practical default, and field finishing remains acceptable where the project accepts the schedule and air-quality tradeoffs. (10.2)

NOTE Factory opaque finishes vary widely in film build, durability, and VOC content; specifying only "opaque finish" produces inconsistent results between suppliers, and the system, coats, and sheen should be stated with VOC limits confirmed against the project's sustainability or local air-quality requirements. (10.4)

NOTE Factory machining to the listed bolt patterns is required for rated doors and strongly preferred for all doors, because it is accurate, label-safe, and avoids field-cutting damage; pre-machining locations and patterns must be specified and confirmed against the hardware schedule before fabrication, or field cuts and RFIs follow. (11.2)

NOTE Oversized and custom doors with non-standard hardware, hospital push/pull plates, or future signage and viewers need blocking placed during fabrication; omitting the blocking layout leads to RFIs when the Owner adds hardware after fabrication, when the leaf can no longer be opened up to add a core. (11.6)

NOTE WDMA I.S.1A Section 5 ties each duty level to laboratory tests: Heavy Duty requires a 1,000,000-cycle operation test plus torsional-load and weight resistance, while Standard Duty requires 500,000 cycles; the duty level specified under Quality Assurance therefore carries a defined, verifiable test basis rather than a marketing label. (12.2)

NOTE A door hung in a racked or out-of-tolerance frame will not maintain rated clearances or close properly, and forcing the fit damages the leaf; frame readiness is a precondition, and the frame itself is furnished under Doors Frames And HardwareDoors, Frames, and HardwareResolves to the current edition.sync/doors-frames-and-hardware. (13.2)

NOTE Warp, delamination, and face damage are not field-repairable on an architectural door and are covered by the warranty; patched or planed-down doors fail inspection and shorten service life, and replacement is the correct remedy. (13.11)

NOTE Premature delivery into an unconditioned building exposes the leaves to the same moisture swings that cause warp in service; the protective wrap stays on until the doors are ready to install and finish. (14.2)

NOTE Storing doors on edge or unevenly supported induces a set that becomes permanent warp; flat, supported storage in the conditioned space preserves flatness until installation. (14.4)

NOTE Veneer and factory finishes mark easily; dragging leaves scratches faces and edges, and clean handling avoids fingerprints and oil staining on transparent-finish faces that telegraph through the topcoat. (14.6)

NOTE Architectural flush doors are commonly warranted for the life of the installation for solid-core interior doors and for shorter terms for hollow-core and exterior doors; the warranty is conditioned on the doors being stored, sealed, finished, and serviced within the published environmental range, which is why the environmental and handling requirements above are enforceable, not advisory. (15.2)

NOTE For projects with many identical openings, a small attic stock of finished, matched doors lets the Owner replace a damaged leaf without re-ordering and re-matching, which is especially valuable for transparent-finish sets where later doors may not match the original flitch. (16.2)