Installation clearance dimensions — the space a product needs around itself to actually work — are missing from almost every spec sheet that crosses an overseas buyer's desk. The L×W×H is there. Net weight is there. Carton size is there. Then the buyer's installer shows up, finds the unit needs 2 inches behind it for airflow and a 36-inch walkway in front, and a correctly-specified product doesn't fit.
Nobody logs that as a size problem. Every dimension you stated was accurate. You labeled the box. You never labeled the space.
Installation clearance dimensions are the minimum gaps a product requires on each side — for ventilation, door swing, service access, and human approach — beyond its own measured footprint. A second set of numbers, and they belong to you, not the installer.
These five myths are costing suppliers orders and paying for return freight. Every figure below comes from a published standard, code, or manufacturer spec, and I've flagged which is which — clearance rules genuinely vary by jurisdiction and by model, and pretending they don't is how disputes start.
Myth 1: Your product's L×W×H tells the buyer everything
Why people believe it: it's what the listing form asks for. Alibaba wants length, width, height. The catalog template has three boxes. Fill them accurately and you've done your job.
The truth: the footprint is what the product occupies. The envelope is what it needs. Different numbers — and the gap between them is where "it doesn't fit" lives.
The evidence: GE Appliances publishes required air clearances that sit entirely outside the product's own dimensions — refrigerators: 1/8″ to 1″ each side, 1″ top, 2″ back; chest freezers: 3″ on all sides; upright freezers under 9 cu ft: 4″ top, 4″ back, 0.5″ per side. A 36″-wide refrigerator does not fit a 36″-wide hole, and the number that tells you so was never in the L×W×H.
It gets worse once heat and people enter. GE specifies 30″ above a cooktop to an unprotected wood or metal cabinet, and 6″ of side clearance above the counter for gas ranges. The National Kitchen & Bath Association's Kitchen Planning Guidelines with Access Standards puts the human requirement at 42″ (1067 mm) minimum for a one-cook work aisle and 48″ (1219 mm) for multiple cooks (Guideline 6).
None of those numbers describe your product. All of them decide whether it can be installed. The box is what you ship. The envelope is what the buyer has to own.
Myth 2: If it fits through the opening, it fits the space
Why people believe it: measuring the doorway is the obvious check, so it feels like the hard part is done. Buyers do it, suppliers assume it's done, everyone moves on.
The truth: passage, installation, and operation are three separate clearances. Clearing the first tells you nothing about the other two — and even the first isn't just a width.
The evidence: the NKBA recommends a doorway clear opening of at least 32″ (813 mm), requiring a minimum 2′10″ door (Guideline 1). But its cited reference, ICC A117.1–2009 §404.2.2, adds a trap: when a passage exceeds 24″ (610 mm) in depth, the minimum clear opening increases to 36″ (914 mm). The depth of the passage changes the width you need. Thick wall, deep reveal, recessed entry — same door, different answer.
Then the door needs room to swing. Per ICC A117.1–2009 §404.2.3, cited in NKBA Guideline 2, a standard hinged door needs pull-side clearance equal to the door width plus 18″ × 60″ (457 mm × 1524 mm), and push-side the door width plus 12″ × 48″ (305 mm × 1219 mm). Guideline 2 states the principle plainly: no entry door should interfere with the safe operation of appliances, and appliance doors shouldn't interfere with one another.
This is the failure that makes buyers ask will furniture fit through the door after they've paid — and the reason folded and assembled dimensions get stated separately, never averaged into one hopeful number.
Myth 3: Clearance is the installer's problem, not the supplier's
Why people believe it: you sell the unit, someone else installs it. The contractor has the tape measure and the local code book. Not your scope.
The truth: the buyer decides before the installer arrives. Clearance is a pre-sale question wearing a post-sale costume. When a buyer can't answer "will this fit my space?" from your listing, they don't email you — they check the competitor whose listing answers it.
The evidence: look at who publishes these numbers. GE Appliances maintains a public per-appliance air-clearance reference and tells buyers to check the installation instructions for their model. When a manufacturer that size treats clearance as buyer-facing information, a supplier's silence doesn't read as "out of scope." It reads as a gap.
And the gap has a price. A wrong-size return in furniture or building materials isn't a polybag going back in the post — it's freight both ways, a damaged unit, and a buyer who won't reorder. Run your numbers with the return cost calculator before deciding clearance labeling isn't worth the design time.
Myth 4: There's one standard set of installation clearance dimensions you can copy
Why people believe it: search "standard clearance," get a number, paste it in. It looks authoritative because it came with a figure.
The truth: clearance varies by jurisdiction, model, and installation condition — and the authorities say so out loud. Copying a number you didn't verify for your product is worse than stating nothing, because now you own it.
The evidence, stacked:
| Source | What it says | What it actually is |
|---|---|---|
| NKBA Kitchen Planning Guidelines with Access Standards | Nearly every guideline carries the line "State or local codes may apply." Code references based on the 2015 IRC; Access Standards on ICC A117.1–2009. | Industry recommendation, not code |
| OSHA 29 CFR 1910.303(g)(1), Table S-1 | Working-space depth at 600V or less: 3 ft for 0–150V to ground under all three conditions; for 151–600V, 3 ft (condition a), 3½ ft (b), 4 ft (c). Width = equipment width or 30 in. (762 mm), whichever is greater. | Enforceable US regulation |
| ADA Standards / US Access Board §305 | Clear floor space 30″ × 48″ (762 mm × 1219 mm) minimum, forward or side approach; 36″ minimum width in alcoves deeper than 24″. | Federal standard (US) |
| GE Appliances air clearances | Top-freezer refrigerator air clearances vary by cubic-foot capacity — check the model's owner's manual. | Manufacturer-specific, per model |
| NKBA Guideline 17 | For enclosed cooking configurations, "a reduction of clearances shall be in accordance with the appliance manufacturer's instructions or per local codes." | Defers to manufacturer + local code |
Read that OSHA row again. The same panel needs 3 ft, 3½ ft, or 4 ft of working depth depending on what's on the other side of the space — nothing about the equipment changed. No single "standard clearance" number survives that. There is only your product's clearance, stated with its basis.
Myth 5: Showing installation clearance means producing CAD drawings
Why people believe it: clearance feels like engineering, engineering means drawings, drawings mean a draftsman and a week you don't have. So it never gets done.
The truth: your buyer isn't building your product. They're checking whether it fits their wall. They don't need a technical drawing — they need the envelope drawn on the photo they're already looking at.
The evidence: NKBA Guideline 13 requires at least 21″ (533 mm) of standing space between the edge of a dishwasher and any countertop frontage, appliance, or cabinet at a right angle to it. As text, that's nearly meaningless. Drawn as a shaded rectangle in front of the unit, it's obvious in a second. Or Guideline 8: allow 32″ (813 mm) behind a seated diner when no traffic passes, 36″ (914 mm) to edge past, 44″ (1118 mm) to walk past. Same product, three space requirements, decided by use case. A picture communicates that; a number can't.
Which is where the fix lives. Not "hire a draftsman," not "take better photos" — lock the real, measured dimensions onto the image where buyers already look: snap-to-edge measurement so the number matches the object instead of a guess, cm and inch together so neither market has to convert, callouts and contour shading that draw the clearance envelope as a visible area, and a one-click export at each platform's spec-diagram size.
The measured part is what matters. Deterministic geometry pins the dimension you actually measured; an AI-generated product image invents a number that looks plausible, sits in a beautiful render, and is wrong — in a clearance context that's not a cosmetic error, it's an installation dispute with your name on it. The boundary matters too: this is a buyer-facing spec diagram, not a CAD file. Nobody fabricates from it. They decide from it. A wall cabinet size-label case study shows the format in practice.
What Actually Works
State two sets of numbers, always: what the product is, and what the product needs. Then show the second set as an area, not a sentence.
What clearance to state, by category
| Category | Clearance the buyer needs | Typical basis |
|---|---|---|
| Refrigeration / appliances | Rear, side, top air clearance | Manufacturer spec — GE: 2″ back / 1″ top / up to 1″ per side; varies by model |
| Cooking appliances | Clearance to combustible surfaces above and beside | Manufacturer spec + local code — GE: 30″ above cooktop to unprotected cabinet |
| Anything with a door or lid | Swing arc + standing room in front of it | ICC A117.1–2009 §404.2.3: pull side = door width + 18″ × 60″ |
| Drawers, pull-outs, slide-out trays | Full extension depth + approach space | ADA §305: 30″ × 48″ clear floor space, forward or side approach |
| Industrial / electrical equipment | Working space depth, width, door-opening arc | OSHA 1910.303(g)(1): 30 in. minimum width, 90-degree door opening, no storage |
| Cabinets / built-ins / modular units | Filler and scribe allowance for out-of-square walls | Field practice — no universal figure |
| Freestanding furniture | Assembled footprint + the walkway it leaves | NKBA Guideline 7: walkway ≥ 36″ (914 mm) |
Note the filler/scribe row honestly: there's no published universal figure — walls are never square, and every fabricator handles it differently. Don't invent one. State the adjustment range your product actually offers. Being explicit about what you don't standardize reads as competence, not weakness.
The clearance-labeling checklist
Run this before any spec image goes to a buyer:
- Product's own measured dimensions stated (L×W×H, assembled)
- Rear clearance stated, with a reason (ventilation / plumbing / cable radius)
- Side clearance stated, both sides — they're often different
- Top clearance stated, including any hinge or lid travel above the case
- Door / drawer swing or extension shown as an arc or shaded area, not a number
- Approach space shown where a person must stand to operate or service it
- Service access identified — which panel opens, and how much room it needs
- Both cm and inch shown on the same diagram
- Each clearance figure labeled with its basis: manufacturer spec / code reference / field practice
- Stated that local code prevails where it's stricter
- Diagram exported at the target platform's image spec
Ten minutes of labeling. That's the entire cost of the fix.
The one-line principle: your buyer isn't asking how big your product is — they're asking how much room it takes to work, and those are two different numbers. Suppliers who state both stop getting the same three emails on every inquiry, because the answer is already sitting in the image.
FAQ
What are installation clearance dimensions?
Installation clearance dimensions are the minimum gaps a product needs around it to be installed, operated, and serviced — separate from and in addition to its own length, width, and height. They cover ventilation gaps, door and drawer swing, approach space for a person, and maintenance access. A product's L×W×H describes the space it fills; clearance describes the space it needs to work.
How much clearance does a refrigerator need behind it?
It depends on the model, and the manufacturer is the only authority. GE Appliances publishes 2″ at the back, 1″ on top, and 1/8″ to 1″ per side, but notes that top-freezer air clearances vary by cubic-foot capacity and that you should check the installation instructions for the specific model. There is no universal refrigerator clearance figure — anyone quoting one without naming a model is guessing.
Is a 36-inch clearance a code requirement or just a recommendation?
Depends which 36 inches. The NKBA's 36″ (914 mm) minimum walkway (Guideline 7) is an industry recommendation — the document itself says "State or local codes may apply." But ICC A117.1–2009 §404.2.2, which the NKBA cites, requires the clear opening to increase to 36″ (914 mm) when a passage exceeds 24″ (610 mm) in depth, and OSHA's 1910.303(g)(1) working-space rules are enforceable US regulation. Same number, different legal weight. Always name the source.
Do I need to show installation clearance on my product listing images?
No platform requires it — which is exactly why it's worth doing. Manufacturers like GE publish clearance openly; most suppliers don't. A listing that shows the clearance envelope answers the question a buyer would otherwise email you about, or skip you over for.
Sources & References
- NKBA — Kitchen Planning Guidelines with Access Standards — industry recommendations, not code; code refs based on the 2015 IRC, Access Standards on ICC A117.1–2009. Guidelines 1, 2, 6, 7, 8, 13, 17.
- OSHA — 29 CFR 1910.303 (Space about electric equipment) — enforceable US regulation. Table S-1, 30 in. width, 90-degree door opening, no-storage rule.
- U.S. Access Board — Guide to the ADA Standards, Chapter 3 — federal standard guidance. §305 clear floor space 30″ × 48″.
- ADA.gov — 2010 ADA Standards for Accessible Design — underlying federal standard.
- GE Appliances — General List of Minimum Air Clearance Requirements — manufacturer spec, varies by model.
- GE Appliances — Refrigerator: Minimum Air Clearance Requirements — manufacturer spec, varies by model.
Next steps
Pick the one that matches where you are:
- If you don't know what clearance your products need: open the installation instructions for your three best-selling SKUs and write down every gap figure. The numbers usually already exist internally — they just never reached the buyer.
- If the numbers are buried in a PDF: move the top three onto the listing. A buyer who has to download an attachment to learn whether your unit fits their wall won't download it.
- If you're not sure it's worth the effort: price the failure first — one wrong-size return at real freight both ways, plus the damaged unit and the buyer who doesn't reorder, against ten minutes of labeling.
- If the numbers exist but the images don't show them: you need the clearance envelope drawn on the product photo — snap-to-edge measurement so figures match the actual object, dual cm/inch units, contour and callout shading to show the envelope as an area, exported at each platform's spec size. Software built on deterministic measurement does this in minutes; an AI image generator returns a convincing render with an invented number.
Start with the doors and the vents. That's where the disputes come from.