MENDNOOK / RESEARCH & METHODS
One opening, three different blind-measuring instructions
An editorial comparison of three published manufacturer or retailer rules, tested against the same explicitly fictional example. Download our inputs to reproduce the arithmetic.
Method: desktop source comparison; reviewed 2026-11-04. Sample: 1 invented opening, 3 documented product categories; field sites: zero. No physical installation, product performance measurement or independent clinical/scientific experiment occurred.
Question and approach
Does the same set of measured opening dimensions always lead to the same blind order dimensions? We recorded the measurement-selection rules from three distinct current Blinds.com guides, then applied only those rules to one fixed illustrative set of readings. We did not combine them into a purported universal guideline.
Fixed example measurements
| Opening axis | Point 1 | Point 2 | Point 3 |
|---|---|---|---|
| Width | Top: 35 1/2 in | Middle: 35 3/8 in | Bottom: 35 1/4 in |
| Height | Left: 60 1/8 in | Center: 60 3/8 in | Right: 60 1/4 in |
All example values are invented solely to illustrate the published rules. They are not data from a home, a survey, a customer order or a test bench.
Results by source-defined product category
| Product | Published selection rule | Example width reference | Example height reference | Source |
|---|---|---|---|---|
| Inside-mount wood blinds | Narrowest of 3 widths; tallest of 3 heights | 35.25 in | 60.375 | Official source |
| Vertical blinds | Top width; shortest of 3 heights | 35.5 in | 60.125 | Official source |
| Quick Ship blinds | Round width down to 1/2-in increment, then subtract 1/2 in; select an offered height | 34.5 in | Product option required | Official source |
Why there is no universal number: the wood-blind example selects the shortest measured width and tallest measured height. The vertical-blind guide instead uses top width and shortest height. The Quick Ship example requires rounding the width down to a 1/2-inch increment, then subtracting 1/2 inch at ordering and requires selection among offered heights. These are different product instructions, not proof one guide is wrong.
Download: Illustrative scenario dataset (CSV). Open it to inspect all six fixed readings and each derived width/height. The absence of a Quick Ship height value is intentional: we did not invent an order-height SKU from an unknown product catalog.
How to reproduce
- Set opening widths to 35.5, 35.375, 35.25 inches; heights to 60.125, 60.375, 60.25 inches.
- For inside-mount wood blinds, compute min(widths) = 35.25, max(heights) = 60.375.
- For vertical blinds, select the first (top) width = 35.5 and min(heights) = 60.125.
- For Quick Ship, start at min(widths) = 35.25, round down to a 1/2-inch increment (35.0), then deduct 0.5 to obtain 34.5 in; choose an order height only after reading the exact available product options and latest instructions.
- Recheck the official sources and your particular product page; revise this comparison if their published rules change.
Sources and limitations
- Blinds.com — inside-mount wood blind measuring guide
- Blinds.com — vertical blinds inside-mount measurement
- Blinds.com — Quick Ship measuring guide
These sources represent different types of products and should not be generalized across brands, markets or versions. The comparison is a reproducible editorial document analysis, not independent field research or a claim about actual failure rates, fit tolerance, cost savings or consumer behavior.
Before ordering, verify depth, bracket requirements, obstructions, fabric deductions, factory adjustments and the current instructions for your exact SKU. For assistance organizing readings, use our inside-mount helper. Corrections are welcome through MendNook corrections.