How to Read a Fire Extinguisher Cabinet Submittal

You have a cabinet submittal in front of you: a dense table of model numbers, letters, and dimensions from the manufacturer, and you have to confirm it matches the drawings and order the right box. This guide teaches you to read that document, decode which dimension is which, and reconcile it against the FEC (fire extinguisher cabinet) callout on your life safety plan.

It is the companion to the fire extinguisher cabinet selection guide, which helps you choose the enclosure (recessed vs. surface, the material, whether you need a cabinet at all). This guide assumes that choice is made and the cabinet is specced, and focuses on reading the manufacturer's sheet so you order the exact model and can get it approved.

In construction, a submittal is the product-data or shop-drawing package a contractor sends to the architect or engineer to demonstrate how the exact product they intend to buy conforms to the contract drawings, for review before the related work proceeds (the contract sets the exact timing). For a fire extinguisher cabinet, that package is the manufacturer's cut sheet: model numbers, materials, dimensions, door and lock options, and any fire rating.

One nuance worth understanding: the designer reviews a submittal for conformance with the design concept, not for finite dimensional accuracy, which remains the contractor's responsibility. An "Approved" or "No Exceptions Taken" stamp is a conformance sign-off, not a transfer of responsibility for the numbers. That is exactly why reading the sheet correctly falls on you: the stamp should not be relied on to catch a wrong tub depth.

The heart of the sheet is three sets of dimensions that people constantly confuse. Reading them wrong is a common cabinet ordering mistake, so this is the section to slow down on. From smallest to largest:

• Tub I.D. (interior clear: width, height, depth) — the actual space inside the box. This is what the extinguisher has to fit into. It is the smallest set of numbers.
• Wall / Rough Opening (width, height, depth) — the hole the installer frames in the wall so the tub can slide in. It is bigger than the tub. This is the dimension the wall opening must be built to.
• Door O.D. (finished outer width and height) — the visible door face, which overlaps and hides the rough opening. It is the largest set (a door is typically the tub width plus roughly 2 in and the tub height plus roughly 2 in). The tub also forms about a 1 in flange that covers the cut edge of the wallboard.

For these recessed, overlapping-door models the relationship is Tub I.D. < Rough Opening < Door O.D. (a surface-mount cabinet has no rough opening at all). The tub holds the extinguisher; the rough opening is the larger framed hole; the door is the face that hides it all. Here is what that looks like on two real (illustrative) Embassy models, so you can see the pattern — read your own model's row off your own sheet:

Illustrative figures from a current Activar Embassy submittal; values change by series and revision. Confirm against the specific cut sheet you were issued.

A related point: whether a given extinguisher actually fits the tub is governed by the extinguisher's physical envelope — its cylinder diameter, overall height including the handle, and width including the hose or horn — not by its weight class or UL rating. Two "10 lb" units can differ enough that a wide-body model will not fit a standard "10 lb" tub, and CO₂ horns need extra width. Manufacturers suggest leaving roughly an inch of clearance where you can, but some real pairings run tighter, so confirm the specific cabinet and extinguisher against their own cut sheets. For the full cylinder-diameter-versus-tub-depth sizing matrix and the wide-body "short" 10 lb trap, use the cabinet selection guide's fit section — this guide is about reading the document, not repeating that matrix.

A cabinet model number is configurational: each part encodes a choice, and the completed string identifies one specific configuration. Changing any one piece changes the number you order. On a typical Embassy-style sheet the pieces are:

• Base series — the tub-size family (for example a 5614 family versus a larger 5714 family). This sets the interior and rough-opening dimensions.
• Material / finish — steel, aluminum, stainless, or a bronze/brass architectural finish. Each changes the model number (a stainless version of a 5614 is a different number than the steel one).
• Door and glazing style — solid, glazed, acrylic or glass panel, full or partial glass, and the pull style.
• Lock option — no lock, a cam or cylinder lock, or a break-glass style (more on locking under code below).

If the cabinet recesses into a fire-resistance-rated wall, the submittal has to document a fire-rated model, because cutting an opening into a rated wall is a penetration that can defeat the rating (this is the IBC Chapter 7 / Section 714 world). On the sheet it shows up as a model suffix — Activar and JL use FX2 — and a label line stating the cabinet is "UL classified and labeled as an approved membrane-penetration firestop system" in accordance with UL 1479 (ASTM E814) and CAN/ULC-S115, for use in walls rated up to one or two hours. (Mirror the exact wording on the SKU you are ordering — some sheets read "classified," others "listed.")

Once you can read the sheet, reconcile it against the drawings and the code before it goes back for approval.

Many submittals carry a column listing recommended extinguishers — for a C5614 it might read "Cosmic & Galaxy 2.5–10 lb, Sentinel 5 lb, Mercury 2.5–5 lb." Those are the manufacturer's own extinguisher families that fit that tub. It is a fit shorthand referencing their SKUs, not a certification, and not a cross-brand compatibility list.

To translate it to the extinguisher you are actually buying, ignore the brand model names and go by size: take the Tub I.D., subtract about an inch of clearance each way, and confirm your candidate extinguisher's published cylinder diameter and overall height (with the handle) fit inside. Watch the footnotes, too — larger cabinets sometimes carry a note that a specific big unit "must be mounted on the back of the tub." The cabinet and the extinguisher are two separate line items that have to match on fit.