Source hierarchy
For an exact product decision, the strongest available source is usually the actual item measured correctly. Before delivery, a model-specific technical drawing or installation manual may be more useful than a general retailer description. Manufacturer pages, retailer pages and packaging can add context, but they may use different definitions, rounding or versions.
No source should be treated as an absolute guarantee. A physical product can differ from a listing, manual or box, and buildings may be uneven or altered.
Measurement references
- Bureau International des Poids et Mesures — SI Brochure, for the International System of Units.
- United States National Institute of Standards and Technology — SI Units: Length, including metric–imperial length relationships.
Accessibility reference
Product and installation sources
Readers should seek the current instructions for the exact model, region and variant. A manual for a similar product, an older generation or a different market may not apply. Installation clearances are not copied into a permanent generic table because requirements can differ by model.
Local and regulated information
Building codes, accessibility requirements, tenancy rules, consumer rights, electrical rules, gas requirements, delivery restrictions and airline limits can change by place and date. Will It Fit? does not act as the official source for them. Use the relevant authority, carrier, manufacturer or qualified professional.
Original tools and examples
The site’s calculators are general planning tools built around user-entered measurements. They do not query a hidden catalogue of product specifications. Examples are illustrative and should not be substituted for actual measurements.