Sealed Brush System Spiral High Speed Door for Dust Ingress Reduction and Cleanroom Air Exchange Control

This Spiral High Speed Door is built for clean and dust-sensitive areas where the doorway must behave like a closure, not an opening. When the door is down, a four-point seal stack closes every leakage path: EPDM brush seals at both guide rails, a mid-height panel joint seal, an insulated flap on the bottom safety edge, and a top seal at the spiral housing entry. The rigid PU-filled aluminum panel behind these seals keeps a flat, true face, so the brushes stay in permanent contact instead of being pushed away by a sagging curtain.

The result is a doorway that limits dust ingress, limits air exchange, and keeps a stable indoor environment without slowing the traffic that has to pass through it.

• Side brush seals — EPDM brush strips in both guide rails, replaceable without removing panels.
• Panel joint seal — continuous gasket along the hinge line stops the joint leakage that usually dominates in modular doors.
• Bottom safety edge — insulated flap follows floor unevenness up to normal construction tolerance and reverses the door on contact.
• Top housing seal — closes the bypass at the spiral entry where air would otherwise escape over the coil.
• Rigid panel face — 0.7 mm aluminum skin over PU core, 40 mm or 43 mm thick, stays flat so seals are not levered open.

• Dust ingress control — a closed seal stack plus a short open window limits particle transfer into the clean zone.
• Reduced air exchange — less uncontrolled mixing between the two sides means less load on air handling and filtration.
• Pressure stability — a doorway that seals properly holds a small pressure differential better, which supports cleanroom classification.
• Draught control — staff working near the doorway are no longer exposed to constant airflow.
• Washdown friendly — smooth coated aluminum panel faces wipe down and the brush seals can be replaced on a schedule.

• Electronics, semiconductor and precision assembly areas
• Pharmaceutical and medical device production corridors
• Food and beverage filling and packaging zones
• Cleanroom personnel and material airlocks
• Paint, coating and printing areas sensitive to dust

1. Tell us the cleanliness requirement, opening size and traffic type.
2. We confirm the seal package, panel thickness and activation sensors.
3. Drawing approval, then 30% T/T deposit and balance before shipment.
4. Production 15–25 working days, sea freight in plywood cases.
5. Remote commissioning support and seal spare parts during warranty.

Payment term is T/T (telegraphic transfer). A 30% deposit confirms the order and the balance is settled before shipment. Price is quoted per project according to opening size and seal configuration.

Air exchange through a doorway comes mainly from side gaps, joints, the floor gap and open time. Closing all four paths and keeping the open window short removes most of that uncontrolled exchange; the exact figure depends on the pressure difference across the opening.

Yes. Brush seals are replaceable on the guide rails and the bottom flap is a serviceable part, so sealing performance can be restored without changing panels.

A rigid sealed leaf holds a modest differential far better than a flexible curtain; for higher differentials we recommend a double door interlock arrangement.

It is commonly used for controlled and clean areas; for the highest classes we recommend the interlock configuration and confirm the seal package during design.

220 V single phase, 50/60 Hz, with integrated servo control.