Application

• Low-leakage inspection access doors of Type BS are used as separating elements for 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, up to nominal size 600 × 600 mm 2000 Pa

Special characteristics

• 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

• B: 500, 600 mm (intermediate sizes: 300 – 800 mm, in increments of 1 mm)
• H: 500, 600 mm (intermediate sizes: 300 – 800 mm, in increments of 1 mm)
• Any combination of B × H

Variants

• R: Right hinge
• L: Left hinge
• 11: Angle section frame with welded fixing tabs
• 21: Angle section frame without fixing tabs

Parts and characteristics

• Door with perimeter seal
• Double lever locking device
• Absorption material
• Hinges
• Frame

Attachments

• Locks, inspection window, 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
• Double lever locking device, can be operated from both sides
• Seal is temperature resistant up to 90 °C
• Maximum pressure loading of 1000 Pa (in closing direction), up to nominal size 600 × 600 mm 2000 Pa; air leakage rate of approx. 0.6 l/s or 2 m³/h at 1000 Pa, up to nominal size 600 × 600 mm approx. 1.1 l/s or 4 m³/h at 2000 Pa

Materials and surfaces

• Door leaf and stiffeners made of galvanised sheet steel
• Absorption material is mineral wool
• Door frame made of galvanised steel 50 × 50 × 4 mm
• Double lever locking device made of aluminium diecast
• APT rubber seal
• 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 according to TRGS 905 and EU directive 97/69/EG
• 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