Type ST

Single and double leaf hinged doors for plant rooms, storage rooms, air handling units, filter chambers, or enclosures for machinery or electrical equipment

Rectangular single leaf or double leaf doors that are robust and ensure only minimal leakage even in case of large differential pressures

  • Maximum width of 1100 mm, maximum height of 2115 mm
  • Maximum pressure loading of 1000 Pa, in closing direction; reinforced construction for up to 2000 Pa
  • Air leakage rate of approx. 0.6 l/s or 2 m³/h at 1000 Pa (for each door leaf)
  • Double skin door leaf made of galvanised sheet steel and with mineral wool infill
  • Door frame made of angle sections or U-channel sections
  • Two double lever locking devices, can be operated from both sides
  • APT rubber seal, temperature resistant up to 90 °C
  • Available in standard sizes and many intermediate sizes


Optional equipment and accessories

  • Sound insulating lining
  • Reinforced construction
  • Any combination of cylinder rim lock, mortice lock, pressure relief valve, inspection window and removable exterior locking levers
  • Powder-coated for outdoor installation

Low-leakage steel door, variant ST-R/Z15 00136679_0

Steel door with inspection window, pressure relief valve and cylinder rim lock(Profile cylinder on the opening side, cylinder rim lock on the closing side)

  • Application
  • Description

Application

  • Low-leakage steel doors of Type ST are used as separating elements for walk-in plant rooms, storage rooms, air handling units, filter chambers, or enclosures for machinery or electrical equipment.
  • Robust construction with very low air leakage rate even in case of large differential pressures
  • Powder-coated construction with increased corrosion resistance
  • Maximum pressure on the opening side is 1000 Pa (2000 Pa for reinforced construction)

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

Nominal sizes

ST (single leaf)

  • B: 500, 600, 800 and 940 mm (intermediate sizes 400 – 1100 mm in increments of 1 mm)
  • H: 1500, 1600, 1800 and 1940 mm (intermediate sizes 800 – 2115 mm in increments of 1 mm)
  • Any combination of B × H

ST-D (double leaf)

  • B: 1080, 1280, 1680 and 1960 mm (intermediate sizes 1080 – 2280 mm in increments of 1 mm)
  • H: 1500, 1600, 1800 and 1940 mm (intermediate sizes 800 – 2115 mm in increments of 1 mm)

Any combination of B × H

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 115 × 40 × 4 mm
  • 15: U-channel frame 240 × 40 × 4 mm 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 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 1000 Pa, 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

Technical information

Function, Technical data, Specification text, Order code, Related products

  • Function
  • Technical data
  • Specification text
  • Order code
Schematic illustration of ST 00106772_0..
① Door
② Door frame (angle section 50 × 50 × 4)
③ Skin thickness 1 mm
④ Skin thickness 1.25 mm
⑤ Stiffener (additional central stiffener from H = 1800 mm)
⑥ Absorption material
⑦ Seal
⑧ Double lever locking device


Functional description

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.

Nominal sizes (single leaf)

400 × 800 to 1100 × 2115 mm

Nominal sizes (double leaf)

1080 × 800 to 2280 × 2115 mm

Maximum pressure on the opening side

1000 Pa (reinforced construction: 2000 Pa)

Weighted sound reduction index (with sound absorbing infill)

Single leaf door 43 – 46  dB, double leaf door 44 – 47 dB, doors on both sides of the wall opening 58 – 61 dB


Weighted sound reduction index

Variant Centre frequency fm [Hz]
Variant 125 250 500 1000 2000
Variant RW
Variant dB

ST-X, ST-X-V

26

38

44

46

46

ST-D-X, ST-D-X-V

28

41

45

49

46

2 × ST-X, ST-X-V, doors on both sides of the wall opening

48

52

59

62

65


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. 0.6 l/s or 2 m³/h at 1000 Pa (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): 400 × 800 – 1100 × 2115 mm
  • Nominal sizes (double leaf): 1080 × 800 – 2280 × 2115 mm
  • Maximum pressure on the opening side: 1000 Pa (reinforced construction: 2000 Pa)
  • 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.

Order example: ST–R/800×1800/21/Z06

Hinge

Right side

Sound insulating lining

Without

Construction of door

Standard construction

Nominal size

800 × 1800 mm

Door frame

Angle section, without fixing tabs

Attachments

Standard construction with inspection window and cylinder rim lock

Surface

Standard construction


Order example: ST–D/1680×1800/21/Z06

Number of door leaves

Double leaf low-leakage steel door

Sound insulating lining

Without

Construction of door

Standard construction

Nominal size

1680 × 1800 mm

Door frame

Angle section, without fixing tabs

Attachments

Standard construction with inspection window and cylinder rim lock

Surface

Standard construction


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

ST

Variant

  • Low-leakage steel door

Parts and characteristics

  • Door with perimeter seal
  • Double lever locking devices
  • Absorption material
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 1000 Pa, in closing direction); air leakage rate of 0.6 l/s or 2 m³/h

ST-V

Variant

  • Low-leakage steel door with reinforced leaf

Parts and characteristics

  • Reinforced door leaf with perimeter seal
  • Double lever locking devices
  • Absorption material
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Screw-fixed stiffeners
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 2000 Pa, in closing direction); air leakage rate of 1.1 l/s or 4 m³/h

ST-X

Variant

  • Low-leakage steel door with sound insulating lining

Parts and characteristics

  • Door with perimeter seal
  • Double lever locking devices
  • Absorption material
  • Sound insulating boards fitted to the inside of the door skins
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 1000 Pa, in closing direction); air leakage rate of 0.6 l/s or 2 m³/h

ST-X-V

Variant

  • Low-leakage steel door with sound insulating lining and reinforcing elements

Parts and characteristics

  • Reinforced door leaf with perimeter seal
  • Double lever locking devices
  • Absorption material
  • Sound insulating boards fitted to the inside of the door skins
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Screw-fixed stiffeners
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 2000 Pa, in closing direction); air leakage rate of 1.1 l/s or 4 m³/h

ST-D

Variant

  • Double leaf low-leakage steel door

Parts and characteristics

  • Two door leaves, both with a perimeter seal
  • Centre mullion
  • Double lever locking devices
  • Absorption material
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 1000 Pa, in closing direction); air leakage rate of 1.1 l/s or 4 m³/h

ST-D-V

Variant

  • Double leaf low-leakage steel door with reinforced leaves

Parts and characteristics

  • Two door leaves, both with reinforcing elements and a perimeter seal
  • Centre mullion
  • Double lever locking devices
  • Absorption material
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Screw-fixed stiffeners
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 2000 Pa, in closing direction); air leakage rate of 2.2 l/s or 8 m³/h

ST-D-X

Variant

  • Double leaf low-leakage steel door with sound insulating lining

Parts and characteristics

  • Two door leaves, both with a perimeter seal
  • Centre mullion
  • Double lever locking devices
  • Absorption material
  • Sound insulating boards fitted to the inside of the door skins
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 1000 Pa, in closing direction); air leakage rate of 1.1 l/s or 4 m³/h

ST-D-X-V

Variant

  • Double leaf low-leakage steel door with sound insulating lining and reinforcing elements

Parts and characteristics

  • Two door leaves, both with reinforcing elements and a perimeter seal
  • Centre mullion
  • Double lever locking devices
  • Absorption material
  • Sound insulating boards fitted to the inside of the door skins
  • Hinges
  • Door frame

Construction features

  • Double skin door leaf; skin thickness of 1 mm and 1.25 mm (opening side), respectively
  • Stiffeners at the level of the double lever locking devices
  • Additional central stiffener from H = 1800 mm
  • Screw-fixed stiffeners
  • Double lever locking devices can be operated from both sides
  • Seal is temperature resistant up to 90 °C
  • Maximum pressure loading of 2000 Pa, in closing direction); air leakage rate of 2.2 l/s or 8 m³/h

ST, width, dimensions

B B1
mm mm

<500

B + 30

500

530

600

630

800

830

940

970


ST, height, dimensions

H H1 X
mm mm

<1500

H + 30

249.5

1500

1530

349.5

1600

1630

349.5

1800

1830

349.5

1940

1970

349.5


ST-D, width, dimensions

B B1 B2
mm mm

B < 1080

(B – 20) ∕ 2

B + 30

1080

530

1110

1280

630

1310

1680

830

1710

1960

970

1990


ST, ST-V, weights

H B [mm]
H 500 600 800 940
mm kg

1500

33

40

53

62

1600

34

41

54

64

1800

35

42

56

66

1940

36

43

57

67


ST-X, ST-X-V, weights

H B [mm]
H 500 600 800 940
mm kg

1500

36

43

58

68

1600

37

44

59

70

1800

38

46

61

71

1940

39

46

62

73


ST-D, ST-D-V, weights

H B [mm]
H 1080 1280 1680 1960
mm kg

1500

66

78

102

120

1600

68

81

106

123

1800

70

83

109

127

1940

72

86

113

131


ST-D-X, ST-D-X-V, weights

H B [mm]
H 1080 1280 1680 1960
mm kg

1500

72

86

113

131

1600

75

88

116

135

1800

77

91

119

139

1940

80

95

124

145


Installation details

  • Installation details

Installation and commissioning

  • Align the frame precisely before mortaring it in
  • When the door is closed, the perimeter seal must be in full contact with the frame

Angle section frame, no. of fixing tabs or flange holes

H ST ST-D
mm

1500

6

8

1600

6

8

1800

8

10

1940

8

10


U-channel door frame, dimensions

Order code detail A
Order code detail mm

13

115

15

240


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For general question regarding products or services you can also call:
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