What Title 24 Part 6 requires for windows and doors in California: U-factor, SHGC and labeling, and what exporters must document.
California Title 24 Fenestration: U-Factor & SHGC Guide Read More »
How FSC and PEFC chain of custody works for doors, what certificate codes to request, and how to verify claims in public databases.
FSC vs PEFC Chain of Custody for Wooden Doors: Buyer Guide Read More »
Target moisture by destination climate, drying schedules and the checks that prevent warping, plus how to write moisture into your door spec.
Kiln Drying Lumber for Doors: Moisture Targets & Defects Read More »
Bulk MDF door pricing by construction and finish, the cost drivers behind each tier, and how thickness and core choice change the real unit cost.
MDF Door Prices per Unit: Bulk FOB Cost Breakdown (2026) Read More »
A 100-point audit for door factories: documents, moisture control, fire-label evidence, QC and packing checks, plus red flags and scoring bands.
Door Factory Audit Checklist: 100-Point Supplier Scorecard Read More »
What bulk plywood doors actually cost FOB China by core, face and finish, what is excluded from most quotes, and how to compare offers like-for-like.
Plywood Door Prices per Unit: Bulk FOB Cost Breakdown Read More »
Classify wooden, plastic, aluminium and steel doors correctly, check duty by destination, and avoid the misclassification errors that delay clearance.
Door HS Codes & Import Duties: 4418, 3925, 7610, 7308 Guide Read More »
Worked loading maths for slabs, prehung sets and crated doors: usable CBM, stack pitch and weight checks, plus a worksheet for your order.
How Many Doors Fit in a 20ft Container? Loading Calculator Read More »
FCL or LCL for doors? Compare cost per CBM, damage risk and lead time, with a break-even guide by shipment volume and packaging type.
FCL vs LCL for Door Shipments: Cost Break-Even by CBM Read More »
What China’s GB/T 8478 grades for air, water and wind performance mean in plain terms, and how export buyers should specify them.
GB/T 8478 Aluminium Windows & Doors: Grades Explained Read More »
New Zealand safety glazing is governed by NZS 4223.3, not NZS 4211. Hazardous locations, marking rules and which glass types comply.
NZS 4223.3 Safety Glazing: Where Safety Glass Is Required (NZ) Read More »
How AS 1530.4 testing produces an FRL, how AS 1905.1 governs the doorset itself, and how to check a test or assessment report before buying.
AS 1530.4 Fire Tests and FRL: Reading an Australian Report Read More »
What BS 476 Part 22 covers, where FD30/FD60 classifications stand today, and how UK projects are moving to EN 1634-1 and EN 13501-2 evidence.
BS 476-22 Fire Door Tests: Status and EN 1634 Transition Read More »
Keep wooden doors stable and good-looking: humidity targets, cleaning by finish type, hardware care and a 12-month inspection schedule.
How to Maintain Wooden Doors: Schedule by Finish & Climate Read More »
Measure backset from door edge to bore center: 60 mm (2-3/8 in) vs 70 mm (2-3/4 in), EU 55/60 mm options, and mistakes that misalign hardware.
Door Lock Backset: How to Measure 2-3/8″ vs 2-3/4″ (60/70 mm) Read More »
Paint alone cannot certify a door. What actually creates a fire rating, when upgrade systems help, and when only a listed doorset is acceptable.
Can You Fireproof a Wooden Door? Ratings, Limits & Options Read More »
EI30, EI60 and EI90 compared: integrity plus insulation, typical wall pairings, thickness and cost impact, and US/UK/AU rating equivalents.
EI30 vs EI60 vs EI90 Fire Doors: Which Rating Do You Need? Read More »
How EN 1634-1 testing works, how results become EI/E classes under EN 13501-2, and what a usable test or classification report must contain.
EN 1634-1 Fire Door Test: Method, Classes & Reports Read More »
UL 10B tests at neutral pressure, UL 10C at positive pressure. Why the difference changes seals, Category A/B doors and what specs to request.
UL 10B vs UL 10C: Neutral vs Positive Pressure Explained Read More »
Use IBC Table 716.1(2) correctly: required door ratings by wall type, vision panel limits and temperature-rise rules, with edition notes.
IBC 716 Opening Protectives: How Fire Door Ratings Are Set Read More »
What NFPA 105 requires for smoke door assemblies: UL 1784 leakage limits, gasketing, labeling and inspection duties, and how it pairs with NFPA 80.
NFPA 105 Smoke Door Assemblies: Requirements & Inspection Read More »
A rattling door is usually latch play, a worn strike or missing seals. Diagnose in 5 minutes and fix it without replacing the door.
How to Stop a Door From Rattling: 6 Causes and Fixes Read More »
Where hinges go on 2,040–2,400 mm doors: top, bottom and middle positions, when to add a third or fourth hinge, and fire-door exceptions.
Door Hinge Spacing Rule: Positions by Door Height & Weight Read More »
Standard handle height is about 900–1,050 mm in most markets; ADA allows 34–48 in. Compare US, UK, EU, AU/NZ and China rules in one table.
Door Handle Height Standard by Country (US, UK, EU, AU) Read More »
Install a prehung door plumb and rattle-free: rough-opening checks, shimming sequence, fixing points and final gap and latch tolerances.
How to Install a Prehung Door: Steps, Shims & Tolerances Read More »
Standard doors do not fit every project. A custom wood door factory turns drawings, sizes and finishes into doors built exactly to order. Jusen Doors, with 20+ years of manufacturing in Nanhai, Foshan, is one such factory-direct source. Here is how custom production works. Design and Engineering You send drawings, photos or a door schedule;
Custom Wood Doors Factory: OEM Manufacturing from Jusen Doors Read More »
Door sizes are quoted two ways: the nominal size people refer to, and the actual slab dimension you order. Mixing them up causes delivery errors on site. This guide explains the difference and how to write a door schedule correctly. Nominal vs Actual Common nominal sizes such as 30×80 or 36×80 are rounded references. The
Nominal Door Sizes Explained: Actual Dimensions, Frames, Buying Guide 2026 Read More »
Replacing a shed door usually means finding the right size and the right material for an opening that has probably warped over the years. This guide covers the options and how to order a replacement that will last. Measure First Measure the opening in three places for width and height and use the smallest figures.
Shed Door Replacement: Options, Sizes and Factory Ordering Read More »
