Ruck 16" Back Draught Damper for Ducting 17MM Hardware and sound an alarm (both

and sound an alarm (both visible and audible) in the event of the CO2 level going above normal or safe levels

U-Turn Wiring: Folds a row back on itself for two-row layouts on one bench

Soil and soilless containers take half a teaspoon to a teaspoon per gallon

Weeks one and two do not need it

Good for germination and propagation: Gentle coverage on seedlings and cuttings

Ruck 16" Back Draught Damper for Ducting 17MM Hardware and sound an alarm (bothBack Draught Shutter for 16" Duct Systems The Ruck 16" 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