Scope: portable and wall-mounted seating used inside a shower or bathtub to sit while bathing or to transfer across a tub wall — shower benches, shower chairs/stools, tub transfer benches, and ADA-style wall-mounted fold-down seats. Excludes grab bars, bath lifts, wheelchairs, and raised toilet seats (separate catalog leaves); commode-combo seating is covered only via a cutout facet, not a separate type.

Seed:
1. Equivalent of the treadwear-grade example: weight_capacity_class — a number every listing carries, but standard/heavy-duty/bariatric bands are set per manufacturer with no single consumer safety standard behind them, so experts add 50lb margin over the user's weight rather than trust the band name.
2. A sommelier-type persona would notice first that "ADA compliant" on a portable bench is borrowed marketing: ADA Section 608 governs permanent fixtures in public accommodations, not take-home equipment, so the 17-19in height claim on a $40 plastic bench is a provenance claim, not a certification.

Sources:
[access_board_ch6] https://www.access-board.gov/ada/guides/chapter-6-bathing-rooms/ — ADA seat height 17-19in above floor, 250lbf structural test, folding seat within 3in of entry, L-shaped vs rectangular — fetched excerpt
[ada_compliance_608] http://www.ada-compliance.com/ada-compliance/608-shower-compartments — 608.4 cross-references seat spec to 610, corroborates structure of the standard — fetched excerpt
[carex_transfer_bench] https://carex.com/blogs/resources/buyers-guide-selecting-the-right-transfer-bench — standard transfer bench 250-300lb, heavy-duty to 500lb; adjustable legs; rust-resistant aluminum/plastic; suction vs padded feet; back vs no back — fetched excerpt
[carex_shower_seat] https://carex.com/blogs/resources/buyers-guide-selecting-the-right-shower-seat — shower seat 250-400lb; stool vs seat vs chair comparison table; swivel/sliding seat; drain holes; Medicare does not cover bath safety equipment — fetched excerpt
[rehabmart_guide] https://www.rehabmart.com/post/how-to-choose-the-best-shower-chair — product-type taxonomy: commode chair, back/no-back, folding/portable, wall-mounted, corner/legless designs, teak/plastic/metal materials — fetched excerpt
[safeathome_guide] https://www.safeathomeguides.com/guides/best-shower-chair-for-seniors — standard 250-300lb vs bariatric 400-600lb; wall-mounted vs freestanding stability trade-off; cost bands by type — fetched excerpt
[homland_blog] https://homland.com/blogs/news/shower-benches-explained-when-you-need-one-and-what-to-look-for — seat height range 14-20in, legs adjust in 1in increments, standard shower 36in wide fits 17-22in bench, anodized aluminum vs coated steel corrosion — fetched excerpt
[wiki_transfer_bench] https://en.wikipedia.org/wiki/Transfer_bench — non-sliding (scoot) vs sliding/rolling mechanism; commode-opening and swing-away armrest accessories; smaller wholly-inside version is a shower chair — fetched excerpt
[pelegon_tb] https://pelegon.com/blogs/news/best-tub-transfer-benches-for-safe-elderly-bathing — corroborates 18in max tub wall for standard sliding benches; swivel-and-slide mechanism; cut-out seat for bariatric hygiene; safety strap — fetched excerpt

Branches:
- product_type -> shower_bench: only bench-specific facets (seat_width_in, no backrest typical) apply; chair-only facets (armrests, swivel) become less relevant. Supported by rehabmart_guide and carex_shower_seat's bench/chair/stool comparison.
- product_type -> transfer_bench: tub_wall_fit and bench_transfer_mechanism apply; routed by carex_transfer_bench and wiki_transfer_bench's straddle-the-wall mechanism description.
- product_type -> wall_mounted_fold_down_seat: mounting_requirement and ada_height_compliant become central, floor-based facets (adjustable_legs, foot_grip) become irrelevant; supported by access_board_ch6 and rehabmart_guide's wall-mounted section.
- transfer_support_need -> needs_seated_transfer pushes toward transfer_bench or sliding/swivel mechanism per wiki_transfer_bench and pelegon_tb.

Noise:
- Price/cost bands (safeathome_guide's $25-$250 table) — excluded per rule: price is never a facet.
- Brand/model names (Carex EZ Swivel Stool, DMI Bariatric, Eagle Health) — excluded, not facets.
- Caregiver installation labor cost — excluded as price-adjacent, not an expert attribute of the product.
- HCPCS/Medicare reimbursement code — noted only as a judgement (non-coverage), not promoted to a facet since it's a policy fact, not a product spec.
- Handheld showerhead pairing (safeathome_guide) — a companion product, out of this leaf's scope.

Corrections:
- Validator rejected reference kind "buyers_guide" (not in schema enum); changed rehabmart_guide, safeathome_guide, and homland_blog to kind "specialist_review".

Corrections (2026-10-26):
- Added `seat_height_range` facet (numeric, 14-22.5in typical) sourced to homland_blog, pelegon_tb, safeathome_guide (all re-fetched and grepped).
- Added `seat_dimensions` facet (text, width x depth) sourced to carex_transfer_bench, carex_shower_seat, pelegon_tb; no numeric range stated since only pelegon gives an actual inch figure.
- Added `portability` facet (lightweight_portable / standard_stationary / not_applicable_wall_mounted) sourced to homland_blog, carex_shower_seat; rejected a separate numeric product-weight facet since only pelegon_tb states an actual pound figure and no second source corroborates it.
- Added `assembly_type` facet (tool_free / tools_required) sourced to homland_blog, pelegon_tb.
- Wired all four new facets into the `product_type` branches' then_ask/makes_irrelevant.
- Renamed weight_capacity_class value `bariatric_400_to_600_plus` to `bariatric_400_to_600` (no source states anything above 600lb) and added a `sources_disagree: true` judgement logging homland_blog's 500lb cap vs safeathome_guide's 600lb cap.
- Demoted `adjustable_legs` definition to drop the single-sourced "1-inch steps" figure (now "small increments").
- Demoted `mounting_requirement` why_experts_care to drop the single-sourced "ADA 250lbf" figure, keeping the structural-requirement claim qualitative.
- Added a `vocabulary` entry defining "Blocking"; dropped the orphaned "Roll-in shower compartment" entry (term never used elsewhere in the register).
- Loosened `transfer_support_need`'s `skip_if_known` to also skip when product_type already answered transfer_bench/wall_mounted_fold_down_seat, and reworded its question to surface the wheelchair value.
- Rejected check.md's "Entry Direction (left/right)" and "commode-compatible seats" notes as out of scope for this fix pass: both are explicitly flagged lower-severity/non-required in check.md (model-specific detail and a scoping call already disclaimed in `hygiene_cutout`), not on the Required fixes list.