Ruck 4" Back Draught Damper for Ducting Soil Secrets it's an indispensable tool for

it's an indispensable tool for achieving optimal plant growth and yield

Nitrogen leads in Grow

and soilless mixtures

Synchronized outlets: Exhaust and CO2 outlets swap so the two never run against each other

We've combined our legacy functionality with consistent

Ruck 4" Back Draught Damper for Ducting Soil Secrets it's an indispensable tool forBack Draught Shutter for 4" Duct Systems The Ruck 4" Back Draught Damper is an essential component for maintaining efficient airflow in ventilation systems. Built with a durable galvanized sheet steel housing, it prevents reverse airflow by automatically sealing off when the fan is off. The spring loaded aluminum flaps respond to active airflow and remain closed when idle, assisted by a secure rubber seal. This back draught shutter is suitable for