The fire performance of a steel fire rated shutter depends on the quality of its curtain plates and lintel. How do you control that? RHIDOOR shares its in-house standards below.
This guide covers steel fire shutter curtain quality and fire shutter lintel quality — the two checks that decide whether your fire rated roller shutter holds when heat hits.
Steel Fire Shutter Curtain Quality: Plate Requirements
Six rules govern the curtain plates:
- Adjacent interlocked plates must swing freely after linking, with no dropout at ±90° swing. Overlapping smoke-resistant plates must also show no dropout at ±90°.
- End baffles or anti-shift mechanisms must sit firmly. After assembly into a roll, plate shift must not exceed 2 mm.
- Plates must stay straight: no more than 1.5 mm per meter, and no more than 0.12% over the full length.
- After assembly, no holes or gaps allowed.
- For smoke-resistant plates, the contact face after the inner and outer nose hooks link must be curved and must contact within a 30° arc.
- After assembly, no tilt during operation; it must rise and fall parallel. Out-of-flatness stays within 1/300 of the opening height.
Fire Shutter Lintel Quality: Sealing the Smoke
Four rules govern the lintel:
- The lintel structure must block fire spread.
- A smoke-resistant lintel must carry a smoke device made of non-combustible material to stop smoke leaking out.
- The smoke device must contact the lintel seal face and curtain surface evenly. Contact area is no less than 80% of the opening width, and gaps in non-contact areas stay no more than 2 mm.
Fire Rated Roller Shutter: On-Site Lintel Fitting
On-site lintel fitting must be firm. Embedded steel parts sit no more than 600 mm apart. RHIDOOR sends installers who check this on the day, because a lintel that shifts defeats the whole fire rated roller shutter.
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Ready to upgrade your facility? RHIDOOR builds steel fire rated roller shutters to spec — MOQ 1 pc, 15-day lead time — and we provide on-site guidance, not just a product. Reach our team at +86 18938501256, WhatsApp wa.me/8618938501256, or email ruihua@rhidoor.com.