Circular backdraught shutters with steel blades and airtight strip for mounting inside the duct. The shutter will open when blades are exposed to overpressure and will shut again when pressure falls away thanks to a stainless steel mechanical spring.

• For airflow control in ventilation systems.
• The blades will open when blades are exposed to overpressure and will shut again when pressure falls away thanks to a stainless steel mechanical spring
• Temperature usage up to 50°C

• Body and blades made of steel
• Built-in mounting

• The shutter is to be installed in horizontal position. The shaft axis must be vertically positioned. The shutter must be inserted fully into the duct.

• Backdraught shutters shall be installed to prevent backdraught when the fan stops
• ATC
• Type OKA-B

• OKA-B, 200

Explanation

OKA-B = Type backdraught damper

200 = Connection diameter