Make your best bottom rolling hangar door purchase decision with this essential checklist. Certain details of structural design, rails, hardware, weather protection, and control systems are often underconsidered or overlooked. Proper choices in these specifics improves long-term durability, reliability, and ease of operation.
| Spec-Dor | Compare | |
|---|---|---|
Structure | ||
| Structural rigidity — diagonal bracing keeps the hangar door frame permanently square | ||
| Bottom door assembly — integrated wheel housings (not bolt-on wheels) that allow easy access | ||
| Custom door sections — factory-engineered to fit hangar door dimensions (not built from smaller sections) | ||
| Engineer certification — approval by a certified mechanical engineer included | ||
Bottom rails | ||
| Hardness-rated steel rails — meeting ASCE or British standard BS11 (not hot rolled square bars or inverted angles) | ||
| Expertly supervised rail installation — critical two-pour concrete process overseen by manufacturer to prevent common, costly errors | ||
| Integrated rail drainage — factory-designed system tied into building drainage (not an improvised fix) | ||
Hardware & moving parts | ||
| Wheel assembly — big alloy steel wheels and correctly sized bearings and axles prevent performance issues and failure of undersized components | ||
| Heavy-duty top rollers — hardened alloy steel, rollers permanently packed with high capacity grease, roller shafts in oversized bronze sleeves | ||
| High capacity door bumpers — concrete-embedded, rubber-padded steel plates transfer impact load to the ground (unlike top track bumpers) | ||
Weather-stripping & sealing | ||
| Top roller sealing system — the most critical sealing component, must be effective within roof deflection range, and easily accessible for maintenance (not costly to reach) | ||
Control systems & drives | ||
| Bevel gearbox — durable, energy-efficient, and tow-friendly in event of power outage (outperforms worm gearbox designs) | ||
| Robust motor power — higher kilowatt and horsepower ratings ensure reliable hangar door operation | ||
| Multiple drive units — in some applications, multiple drives improve reliability over a single drive system | ||
| Variable Speed Drives (VSD) — smooth, precise acceleration/deceleration with no mechanical shock or noise | ||
| Advanced user interface — user-friendly joysticks and pendant pushbutton controls | ||
| Advanced safety & security — wireless transmitters, safety edges, personnel door lockout switches, integrated access control | ||
| Standards-compliant — built to UL or other applicable standards, with correct wire sizing and comprehensive labelling | ||
Learn more about each of these critical specifications in Spec-Dor’s free downloadable Aircraft Hangar Door Buyer’s Guide. Investing a few minutes to read the guide can make all the difference in securing years of trouble-free operation and easy maintenance with minimal downtime.
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