Ruck 4" Back Draught Damper for Ducting Micro Nutrients 3-outlet power strip: Lands a

3-outlet power strip: Lands a fan

weighing only 1 lb and measuring 6 × 6 × 2 inches (L × W × H)

limiting heat transfer in cooler months

Same great features and processing power of the Original trimmer with a few extras to make the trimming process more enjoyable

Ruck 4" Back Draught Damper for Ducting Micro Nutrients 3-outlet power strip: Lands aBack 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