Description
Variants
- ST: Low-leakage steel door
- ST-V: Low-leakage steel door with reinforced leaf
- ST-X: Low-leakage steel door with sound insulating lining
- ST-X-V: Low-leakage steel door with sound insulating lining and reinforcing elements
- ST-D: Double leaf low-leakage steel door
- ST-D-V: Double leaf low-leakage steel door with reinforced leaves
- ST-D-X: Double leaf low-leakage steel door with sound insulating lining
- ST-D-X-V: Double leaf low-leakage steel door with sound insulating lining and reinforcing elements
- R: Right hinge
- L: Left hinge
Parts and characteristics
- Door with perimeter seal
- Double lever locking devices
- Absorption material
- Hinges
- Door frame
Attachments
- 11: Angle section frame with welded fixing tabs
- 13: U-channel frame 5 × 2 × 0.2 in
- 15: U-channel frame 9 × 2 × 0.2 in with welded fixing tabs
- 21: Angle section frame without fixing tabs
- Locks, inspection window, pressure relief valve, front locking lever: for the improvement and extension of the range of applications
Construction features
- Double skin door leaf; skin thickness of 0.04 in and 0.05 in (opening side), respectively
- Stiffeners at the level of the double lever locking devices
- Additional central stiffener from H = 71 in
- Double lever locking devices can be operated from both sides
- Seal is temperature resistant up to 194 °F
- Maximum pressure loading of 4.02 in w.g., in closing direction
Materials and surfaces
- Door leaf and stiffeners made of galvanised sheet steel
- Reinforced construction (V): Screw-fixed stiffeners
- Absorption material is mineral wool
- Door frame made of galvanised steel
- Double lever locking devices made of aluminium diecast
- APT rubber seal
- Sound absorbing Bitumen K57 slabs
- P1: Powder-coated, RAL CLASSIC colour
- PS: Powder-coated, NCS or DB colour
Mineral wool
- To DIN 4102, fire rating class A2, non-combustible
- RAL quality mark RAL-GZ 388
- Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
- Inert to fungal and bacterial growth
Maintenance
- Maintenance-free as construction and materials are not subject to wear
- Contamination should be removed as it may lead to corrosion and to increased closed door air leakage
Function
Low-leakage steel doors are low-leakage separating elements for rooms or other enclosures.
When the door is being closed, i.e. when the double locking levers are being turned, the perimeter seal is fully pressed against the frame. As a consequence, the air leakage rate is extremely low even in case of high differential pressures.
Schematic Illustration of ST
① Door
② Door frame (angle section 2 × 2 × 0.2)
③ Skin thickness 0.04 in
④ Skin thickness 0.05 in
⑤ Stiffener (additional central stiffener from H = 71 in)
⑥ Absorption material
⑦ Seal
⑧ Double lever locking device
Specification Text
Low-leakage steel doors as separating elements for walk-in plant rooms, storage rooms, air handling units, filter chambers, or enclosures for machinery or electrical equipment.
Ready-to-install component that consists of a door leaf with double lever locking devices, absorption material, seal and hinges, and a frame.
Air leakage rate on the opening side is approx. 1.29 cfm at 4.02 in w.g. (single leaf door).
Special characteristics
- Variants with additional sound insulating lining (X construction variants) provide good sound absorption
- U-value: 1.02 W/(m²K) at 8 W/(m²K) for internal spaces (air not in motion) and 25 W/(m²K) for outside (air in motion)
- Optional door frame without fixing tabs (-21) but with flange holes
Materials and surfaces
- Door leaf and stiffeners made of galvanised sheet steel
- Reinforced construction (V): Screw-fixed stiffeners
- Absorption material is mineral wool
- Door frame made of galvanised steel
- Double lever locking devices made of aluminium diecast
- APT rubber seal
- Sound absorbing Bitumen K57 slabs
- P1: Powder-coated, RAL CLASSIC colour
- PS: Powder-coated, NCS or DB colour
Mineral wool
- To DIN 4102, fire rating class A2, non-combustible
- RAL quality mark RAL-GZ 388
- Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
- Inert to fungal and bacterial growth
Technical data
- Nominal sizes (single leaf): 16 × 32 – 43 × 83 in
- Nominal sizes (double leaf): 43 × 32 – 90 × 83 in
- Maximum pressure on the opening side: 4.02 in w.g. (reinforced construction: 8.03 in w.g.)
- Weighted sound reduction index (with sound absorbing infill): single leaf door 43 – 46 dB, double leaf door 44 – 47 dB, on the left and right of the wall opening 58 – 61 dB
This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.
