RHIDOOR Industrial Doors

RHidoor compiled these new specification requirements to help you understand fire-rated roller shutters better.

They split into steel shutter requirements and inorganic-fabric shutter requirements. Details below.

Premium inorganic-fabric fire-rated shutter requirements:
1. Curtain fabric: raw materials must meet health and environmental rules; no banned materials.
2. Curtain face, drum, and fixings: technical requirements apply.
3. The inorganic composite curtain face must not connect directly to the drum; it links via fixings.
4. Rails and embedded steel: rails fitted firmly on site; embedded steel 600–1000 mm apart. For vertical shutters, rail verticality error vs. base ≤1.5 mm/m and ≤20 mm over full length.
5. Lintel and embedded steel: fitted firmly; embedded steel 600–1000 mm apart.
6. Bottom bar: (a) parallel to ground, even contact; (b) stiffness greater than the curtain face, with a firm connection.
7. Drive: sprockets, chain, bearings. Roller chain and sprocket dimensions and tolerances per GB/T 1243; static strength and chosen safety factor above 4. Drive, bearings, and chain surfaces free of rust, with proper lubricant. Vertical shutter drum deflection in normal use below 1/400 of drum length. Side-coiling shutter drum must be perpendicular to base; verticality error below 1.5 mm/m and below 5 mm over full length.

When buying an aluminum alloy roller shutter you may not know the profiles or the installation, so RHidoor covers the basics. Against ordinary shutters, aluminum wins on looks, eco-friendliness, and safety. You can spray any color or pattern on the surface, or apply a film with embossed wood or sand texture, which lifts the grade of your shop and helps it stand out.

The curtain’s material and structure block strong light and UV, ending the greenhouse effect from sunlight indoors. It suits any climate, protects the indoor space long term, and testing shows 100% sun block and over 95% temperature block.

Aluminum shutter profiles and models:
77#, 65#, 55#, 50#, plus perforated 77# and 50#.

Two common profiles:
1. Double-layer aluminum slat, effective width 77 mm, with a noise-damping strip between slats for truly silent operation. A thickened, widened aluminum guide gives wind resistance for large spans. Used in villa garages, shops, and large factories or warehouses; max span 8.5 m.
2. Double-layer non-perforated aluminum slat, effective width 55 mm, with a 20×2.3 mm vent hole at the hook for light and air. The noise-damping strip keeps it silent. Use width ≤4000 mm.

Installation:
1. Check the manual chain hangs down, fix the motor to the board, link the chain to the wheel and motor base gear (tighten well), connect the remote box to the motor, and test the handle direction. If reversed, the remote receiver has a black button on the side; flip it to the other side.
2. Measure the main and sub boards to confirm size, then set the shaft on the side plates. First mark a level line on the shaft, drill with a 10 mm bit every 50 cm (keep them straight), weld a 14 mm nut to the shaft perpendicular to its hole and weld it firm. Align the first slat center with the shaft hole and drill vertically with a 10 mm bit. (You can also use self-tappers; thread the aluminum slats and cap both ends, riveting each as you go.) After capping, loop a rope over the shaft and drill a hole in the curtain, tie one end, have someone hold the other, press the up button to run the shaft and pull the curtain up, and bolt the curtain to the shaft (level, tightened with washers). Raise it firmly.
3. Cut one rail end into a V, level the curtain, set the upper and lower limits: left pulley is the upper limit, right is the lower.

The fire performance of a steel fire-rated shutter depends on the quality of its curtain plates and lintel. How are those controlled? RHidoor shares its in-house standards.

Curtain plate requirements:
1. 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°.
2. End baffles or anti-shift mechanisms must be fitted firmly; after assembly into a roll, plate shift must not exceed 2 mm.
3. Plates must be straight: straightness no more than 1.5 mm per meter, and no more than 0.12% over the full length.
4. After assembly, no holes or gaps allowed.
5. 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.
6. After assembly, no tilt during operation; it must rise and fall parallel. Out-of-flatness no more than 1/300 of the opening height.

Lintel requirements:
1. The lintel structure must effectively block fire spread.
2. A smoke-resistant lintel must carry a smoke device made of non-combustible material to stop smoke leaking out.
3. The smoke device must contact the lintel seal face and curtain surface evenly; contact area no less than 80% of the opening width, and gaps in non-contact areas no more than 2 mm.
4. On-site lintel fitting must be firm; embedded steel parts no more than 600 mm apart.

As industries advance, fire-safety implementation and management are essential. Under fire regulations, the quarterly routine inspection always checks fire-rated shutter facilities.

The fire-rated roller shutter is a fire and heat barrier for large openings in buildings, usually where a fire wall is awkward: open elevator halls, escalators, wide department-store floors, exhibition hall openings, and similar spots where fire doors and windows don’t fit.

In construction, first understand its structure. It has 13 parts: curtain plate, bottom bar, rails, brackets, drum, housing, control box, motor, limiter, lintel, manual quick-release, button switch, and safety device. From that structure, the body does the fire blocking and the lintel and rails do the smoke blocking. So when buying, watch the material of the body, lintel, and rails. As a long-established maker, RHidoor supplies quality products.

What to watch when buying:
1. Curtain: RHidoor’s steel fire-rated shutter uses 1.0 mm national-standard galvanized steel, filled with aluminum silicate cotton. The premium (inorganic) shutter uses a 4-layer build: 0.32 mm blue decorative cloth, 2.0 mm ceramic fiber cloth, 15 mm fire blanket, and 0.32 mm heat-radiation cloth. These materials hold a fire rating above 4 hours and strongly limit spread.
2. Lintel: RHidoor installs 1.0 mm steel fire-rated shutter slats as the lintel, which are fire- and smoke-rated.
3. Pre-roll: RHidoor designs pre-roll in from the start. The pre-roll length reaches 500 mm, which cuts the pull on the first slat and stops the curtain from coming off.
4. Bottom beam: RHidoor’s bottom beam is 40×70 mm at 1.5 mm, with a counterweight so the curtain drops by its own weight if the thermal fuse fails, bringing the door down faster.
5. Rails: RHidoor uses two rail types, embedded (90 mm deep, 1.5 mm) and exposed (90 mm deep, 3 mm), both with anti-smoke strips that strongly limit smoke spread.

As high-rises multiply, fire risk is well known, and fire trucks can’t reach those heights, so fire equipment is a must. The fire-rated roller shutter protects life and property, but not every “fire-rated” shutter actually resists fire. A real one does, and the difference from an ordinary shutter is that besides the fire barrier it also stops fire and smoke from spreading, because it’s made of fire-resistant material. The making and the materials differ too.

For high-rise installation, the shutter is the inorganic-fabric fire-rated type; steel fire-rated shutters generally don’t suit indoor high-rise partitions. What is the inorganic-fabric shutter made of?
a. Top layer: blue fabric, a flame-retardant blue fiberglass cloth. Good from −70°C to 230°C.
b. Fire-resistant cotton: sits under the flame-retardant fabric. A new fire material made by a special process; it barely burns and self-extinguishes after the source is gone.
c. The fiber flame-retardant tech: inorganic and organic polymers compound and interpenetrate, so the inorganic flame retardant sits in the organic fiber at nano scale or as an interpenetrating network. You keep the fiber strength and get low toxicity, low smoke, no melt-drip, and no environmental harm. The fiber and textile gain both flame retardancy and anti-drip.
d. Refractory felt: made from calcined bauxite, spun and set. Low thermal conductivity and heat capacity, good thermal stability and impact resistance, low tensile strength, strong insulation, fire resistance, and sound absorption. Withstands 1100°C–1260°C.
Ordinary shutters use stainless steel or PVC, hollow or transparent. They look far better than fire-rated shutters but fall well short on safety. Which to buy is the customer’s call; it comes down to what you actually need.
Fire-rated shutters have fire ratings; ordinary ones don’t.
F1: 1.50h. F2: 2.0h. Composite steel shutter: F3: 2.50h; F4: 3.00h. The national standard for steel shutter fire grading doesn’t require measuring the unexposed-side temperature rise, nor uses it to judge the rating. In recent years mist-type and evaporative mist-type steel shutters appeared; by the higher rules, when used as a compartment element the unexposed-side temperature rise must be the judging condition. To tell the two grading bases apart: a shutter that meets all judging conditions including unexposed-side temperature rise, with a rating ≥3.0h, is called a premium shutter. Any shutter in fire testing that does not use unexposed-side temperature rise as the judging condition is an ordinary shutter.

After the return to work following the epidemic, the edge RHidoor’s fire-rated electric roller shutter brings is improved automatic control. Let’s get into the specifics.

The fast fire-rated electric shutter is mainly used in high-rise buildings, to seal off the fire source at stairwells or elevator lobbies and let people escape safely. In medium and large commercial buildings it also works as a fire wall. So it plays a big part in building fire safety. Here’s a primer on the electric fast fire-rated shutter across design, use, and installation. In high-rise residential and multi-story public buildings, control of the electric fast fire-rated shutter should meet three methods at once: automatic, local manual, and remote from the fire control room. This is spelled out in the Code for Electrical Design of Civil Buildings.

The automatic signal comes from smoke and heat detectors on the ceiling on one or both sides of the shutter. The signal goes to the link control box, which sends the execute command to the shutter control box, raising or lowering the fast shutter.

For a shutter at the elevator lobby of a high-rise office or residential building, fire is more likely on the corridor side than the stairwell side. So consider a pair of smoke and heat detectors on the corridor side, and just one smoke detector on the inner elevator side. The two smoke detectors inside and outside act together. When either picks up smoke, the door drops 1.8 m from the floor. If the fire door between the elevator lobby and the escape stairwell is also a shutter, fit a pair of smoke/heat detectors in the lobby to control that stairwell door too.

When designing the fire linkage system, watch the control voltage. The shutter link control box is a signal output device in the alarm series. By rule its working voltage is DC 24V, but makers may allow AC 36V and above for reliability and safety. So the shutter has two control voltages: DC 24V and AC 220V. On a straight run in one fire zone, one shutter dropping won’t hurt the fire function. Smoke spreads fast; after the first shutter drops, if the fire isn’t controlled the smoke reaches the second shutter and drops it too. The second-stage drop is controlled by the heat detector at that spot.

When several shutters seal one straight fire-zone run, keep the detectors encoded in groups of three or fewer. When any pair signals, all three drop together. Then one link control box drives one shutter, and the rest sit on the automatic control line. Each shutter control box parallels the one driven directly by the link box. Starting more than three at once draws a large current, so the relays, main switch, and wiring must scale up, which is wasteful. Also, too many units on one group means more failure points and slower fixes.

Fire-rated roller shutters are specified for many large malls and related government buildings as a fire-safe door. They retract easily and save space. Here’s what you want to know about size, price, and installation, from RHidoor.

The fire-rated shutter is a best-seller in the fire-safety market, and it’s used in more places all the time. There’s no fixed size rule because each one is made to order. Price moves with that.
Best material? The main types: composite steel fire-rated shutter (fire and smoke), inorganic premium fire-rated shutter (double track, double curtain), steel composite water-spray mist type, steel composite side-coiling type, steel composite horizontal type, inorganic premium folding type, and variants with mid-curtain doors.
By opening method: manual and electric. Manual uses the torsion spring on the shaft to open and close; electric uses a dedicated motor to turn the shaft and stops automatically at the set limits.
By curtain material: inorganic fabric, mesh, aluminum, crystal, stainless steel, color-steel, and reinforced wind-resistant.
Installation: in-wall or beside-wall (inside or outside the opening); by opening direction: top-roll or side-roll. Uses vary: ordinary, wind-resistant, fire-rated, high-speed, and silent Australian-style electric, among others.

RHidoor’s installed shutters are well liked. The door pushes up or rolls to the side, resists forced entry, and comes in inner, outer, or middle mounting to suit the building. It looks clean and modern.

Reminder from RHidoor: know your door size before you buy, because shutters are made to measure. We can send someone to measure on site for free. Call +86 18938501256 (ruihua@rhidoor.com) if you need it.

As technology has moved on, so have the roller shutters we use. They’re now common in warehouses, garages, and shops, and their convenience has drawn plenty of attention. High-speed shutters are taking over while ordinary ones fade out. So what’s the actual difference? Here’s the breakdown.

(1) Different operation. A high-speed shutter opens and closes with one button; an ordinary one is pulled by hand. That’s the main draw of the high-speed version: less effort, more convenience.

(2) Less noise. Ordinary shutters are pulled manually, so the force isn’t even and the wear against the frame is uneven, which makes a lot of noise. High-speed shutters are automated, so the force and wear spread evenly and the noise is far lower.

(3) Different build. A high-speed shutter has to lift and lower steadily and quickly, so it needs a high-spec high-frequency motor. Ordinary shutters don’t ask for much in lifting, speed, or automation, so a standard motor is fine.

(4) Different price. High-speed shutters cost more because they’re better equipped and faster, but in practice their value for money beats the ordinary kind.

When you pick a shutter, match it to what you actually need. Either way, choose a maker with good quality and reliable service, both for day-to-day use and for quick fixes when something goes wrong. For more on shutters, call +86 18938501256 (ruihua@rhidoor.com), RHidoor.

Our principle: survive on quality, grow on reputation, start from the customer, and let the details decide the outcome.

Crystal roller shutters are the go-to choice for malls and street-facing shops, mostly because of these strengths:

They give the store a full display window, so the window-shopping effect works even with the door closed. Great for high-footfall locations.
Made from polycarbonate, they resist break-ins, so security isn’t a worry.
The electric version stays fully transparent yet quiet and sealed, and keeps out wind, rain, and dust.
The material is engineered for strength: reinforced aluminum-embedded PC slats. Strong enough for large storefronts, and customizable to order.
Clean, simple look that’s attractive and modern. Can mount up/down or left/right, which helps in tight spaces.
Impact resistance: 80× glass for the sheet, 200× glass for solid crystal. It won’t shatter like ordinary glass, so it’s safer. Chemical resistance: polycarbonate stands up well to organic and inorganic acids, weak acids, plants, neutral salt solutions, aliphatic hydrocarbons, and alcohols at room temperature.
Flame behavior: polycarbonate’s natural temperature is 630°C. Tested by the national fire-quality supervision center, PC board reaches GB8624-1997 B1 (self-extinguishing), so it counts as a flame-retardant engineering material. Temperature range: it handles −30°C to +120°C.
Light stability: polycarbonate has the highest transmission in visible and near-infrared light, 12–18% light transmittance, with UV resistance and anti-aging. The surface has a co-extruded UV layer, so it holds up outdoors.

RHidoor is a dedicated roller shutter manufacturer. Main products: fire-rated, crystal, profile, high-speed, and industrial doors. We ship worldwide and provide test reports from the relevant authorities. Our installation team does on-site fitting for free. To learn more, visit us or call +86 18938501256 (ruihua@rhidoor.com).

Electric roller shutters, also called high-speed doors, are motor-driven industrial doors that open and close fast. They seal well, insulate, and resist wind and theft, so they show up all over the market, and you’ll find plenty of variants.

Which material is best? Honestly, there’s no single winner. Each material has its own strengths, and what matters is where the door goes. For an interior passage in an office, a PVC shutter makes sense: PVC is cheap, comes in many colors, and is easy to swap. If a panel gets torn or cut, you just replace the curtain.

For a storefront exposed to the street, you want theft resistance, so pick a hard shutter or a stainless steel shutter. The frame is solid and hard to damage. It opens and closes quickly and doubles as a security door.

If the opening is large and you open and close it rarely, a sliding door is worth considering. RHidoor makes many types, so use these as a starting point: PVC, aluminum, stainless steel, steel fire-rated, crystal, stack doors, sectional doors, and sliding doors.

Safety features on electric roller shutters:
– Door operator: the drive unit that powers opening and closing.
– Operator lock: stops the motor shaft from turning backward under force and opening the door.
– Obstacle rebound: if the door meets something while descending, the operator reverses and opens.
– Photo-eye guard: an infrared safety device.
– Safety bottom sensor: an airbag at the door base; a pressure change sends a signal to the controller.
– Guide and noise-reduction system: fitted on both sides of the color-steel door, it guides the door and cuts friction noise.
– Backup power: a battery added so the operator still runs when normal power fails.

My take: there’s no point arguing over which material is best. The right door is the one that fits your situation. For purchase or service, call +86 18938501256 (ruihua@rhidoor.com).

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