Foshan has tight fire safety enforcement. Here are the quality requirements installers need to meet.
Verticality: Guide rails must be within 1mm of plumb per meter of height, and no more than 3mm total deviation. Use a laser or water level for verification. Take measurements at the top, middle, and bottom of each rail. Record them.
Positioning: The center of the door must align with the center of the opening within plus or minus 2mm. This affects the balance of the curtain in the rails and the evenness of wear.
Anchor depth: Expansion bolts in concrete must be embedded at least 60mm for M10 bolts, 80mm for M12. For chemical anchors in brick, the embedment depth should be at least 80mm with proper hole cleaning before injection.
Weld quality: All structural welds must be full-penetration or fillet welds, not tack welds. Slag must be removed. Welds must be painted with zinc-rich primer. No cracks, porosity, or undercut.
Curtain winding: The curtain must roll evenly on the barrel. The edges must be aligned within plus or minus 3mm side to side. If it's biased to one side, the door will track poorly and wear the guide rail unevenly.
Bottom beam contact: When fully closed, the bottom beam must contact the floor along its entire length. Any gap over 3mm is a smoke path and must be corrected. Shim or grind the floor if needed, or use a compressible seal.
Control box installation: Must be at a height between 1.3 and 1.5 meters from the floor. Must be accessible. Wiring must be in conduit. All cables must be labeled. The fire alarm interface terminals must be clearly marked.
Testing before handover: Ten full operational cycles. One fire signal simulation with full descent. One manual quick-release test. One battery backup test. Document the results with the date, tester name, and pass/fail status for each test.
Documentation to hand over: Fire rating test report (copy), installation as-built drawing showing dimensions and fixing details, operating manual, maintenance schedule, warranty card, test results from the commissioning.
Any deviation from these requirements should be documented and justified. The fire department inspector will check. So will the building owner's representative. Getting it right the first time costs far less than re-doing it.