Plastic Ventilation Grilles with Gravity Shutters KRZ

Series Overview

The KRZ series plastic ventilation grilles by Dospel (Poland) are designed for connection to round ducts in exhaust ventilation systems. The key feature of the series is the gravity shutters, which act as a built-in backdraft damper: they open under the pressure of the airflow and automatically close under their own weight when the ventilation is not running. This prevents reverse airflow, odour ingress and moisture penetration through the ventilation duct.

Key Features

• Material: High-quality ABS plastic — lightweight, moisture-resistant, and UV-stable.
• Gravity shutters: Open automatically when airflow is present and close under their own weight — built-in backdraft damper function with no additional mechanisms required.
• Installation: Vertical position only — the shutters must face downward for correct operation.
• Colour: White (RAL 9010) and brown — to suit interiors with different finishes.
• Connection: Round spigot for connection to standard circular ducts.
• Application: Kitchens, bathrooms, utility rooms — for exhaust ventilation systems with intermittently operating fans.

Available Sizes