What the term actually names
On a pet fan, the claw guard is the structure that keeps the animal away from the moving parts: the outer mesh or grille, the rim that retains it, and the standoffs or pillars that fix its position in front of the blade. A buyer can check the gap between those parts and the rotating assembly behind them. Anti-claw describes an intention, while a gap specification describes the product. The intention cannot be re-measured; the gap can.
The vocabulary has three members that are frequently run together. The through-gap is the opening a tooth or claw could pass through. The access gap is the distance from an exposed rotating surface to the nearest fixed part. The mesh aperture is the individual hole in the protective grid. Each answers a different question, and each is recorded differently. When a supplier quotes one number to cover all three, the buyer has not been given a specification.
Where the measurement happens
A gap value without a measurement position is a value without a method. Ask where each gap is taken. On the guard alone, or on the guard fitted to the housing? At the centre, at the corner, or swept across the whole perimeter? On the golden sample, or on a production article pulled from the line? Position matters because injection-moulded ribs, weld lines and sink marks can open an opening in one place and close it in another, and a drawing that says one number at the centre can behave differently at the rim.
The second half of the method is the simulator or probe. Some suppliers measure with a gauge of defined thickness, some use a tapered probe, and some photograph the opening against a scale. Ask what the instrument is, whether it is calibrated, and whether the same instrument is used at incoming inspection. A buyer does not need the supplier's internal standard to equal their own, but the report should state which standard was applied and to which sample.
The three gaps side by side
Gap table: the entry as it should be written
| Gap | Where it is measured | What it addresses | Record to request |
|---|---|---|---|
| Through-gap | Across the outer mesh opening | A tooth or claw entering the guard | Mesh aperture record and the probe used |
| Access gap | From blade tip to nearest fixed part | Contact with the rotating assembly | Position sketch and the measurement tool |
| Perimeter gap | Around the guard rim and standoffs | A digit reaching under or behind the rim | Rim drawing and the fit condition |
| Assembled gap | After guard and housing are fitted | Change caused by assembly | Fit tolerance note and sample condition |
| Re-measured gap | On the production article | Drift between sample and tooling | Batch inspection sheet |
Why gaps move after the sample
A gap is not frozen at the first sample. Change the mesh supplier, the rim tool, the standoff material, or the housing tolerance, and the opening can move. This is why the gap record should carry the revision it belongs to. A buyer who keeps one drawing revision from the prototype stage and expects the production article to match it is working with a stale reference.
The useful habit is to re-measure the gap at the two points where the decision is made: at golden sample sign-off, and at the first article inspection of the production tool. The two numbers can differ for honest reasons, including mould shrinkage and assembly fit, and the record should explain the difference rather than let it pass silently. Where the change is unexplained, the gap has become a documentation gap as well as a mechanical one.
Boundary: a guard is not a containment system
A claw guard limits reach. It does not stop a pet from pushing, biting or pulling the fan, and it does not make the unit safe to leave with an animal unattended. A mesh that passes a gap check can still deform under load, and a rim that looks closed in one view can open at the corner from another angle.
Guard ≠ enclosure. The guard is one element of the enclosure; the housing, the standoffs and the mount complete it.
Guard ≠ bite-proof. A gap check measures an opening, not the force a material survives, and those are separate tests.
Guard ≠ child-proof. The same openings can be reached by a smaller or more determined animal, and a guard record does not address that.
Records that carry the claim
Ask for the gap measurement record for the exact model and revision being quoted. It should name the sample, the gauge or probe, the positions measured, the measured values and the acceptance criterion. Ask whether the record came from the supplier's own process or from a third-party test, and use either as usable evidence provided the method is written down. The detail that matters is who measured and when, because a record without an owner can be produced after a dispute has started.
Ask also for the guard drawing with the gap callouts and for the housing drawing that shows the assembled condition. When the two documents describe the same opening differently, that is a defect the buyer inherits at sample approval. Keep the record with the quotation rather than in a separate folder, so the price, the specification and the evidence sit in one place.
Five questions to put to the supplier
- Which gap is specified for this model: through-gap, access gap, perimeter gap, or all three?
- Where on the guard is each measurement taken, and is the position marked on the drawing?
- What probe or gauge is used, and is it calibrated with a recorded calibration status?
- On which sample was the gap measured: prototype, golden sample, or production article?
- What happens to the gap when the guard is fitted and the housing is assembled?
Where this sits next
The one-term glossary entry for the same idea is Glossary: Guard Gap on a Pet Fan. The mechanical neighbour is Battery Bay Seals on Pet Fans, which covers the enclosure rather than the opening. The material-side question, whether the guard can be chewed, is in Chewable Contact Areas: Material Declarations. The mount-side question, how firmly the fan holds the bar, is in Clamp Force Checklist for Stroller and Crate Fans. The cleaning consequence of a guard you can remove is in Cleaning a Pet Fan: What Is Washable. Send the gap-record request through contact and we will show you which fields are missing.
Filed under the Pawluno pet-comfort programme. Illustrative specifications; confirm chew, clamp and battery-bay tests with the supplier.