ACI Backdraft Damper Ducting Inserts Size:4" Replaces Pro Core during the

Replaces Pro Core during the final 3 weeks of flower

and 100-125V AC wall adapter

Some prefer the pumice as rice hulls will eventually break down

so that the supply of fresh herbs does not run out

ACI Backdraft Damper Ducting Inserts Size:4" Replaces Pro Core during theA ventilation ducting tool designed for insertion into ducting to prevent cold drafts and debris from flowing into ventilation systems. Built to be embedded in ducts, the backdraft damper is made of sturdy galvanized steel and features two rings of outer rubber gaskets. This enables it to grip your ducting with an airtight seal in either a horizontal or vertical orientation. The butterfly damper blades are made of aluminum and are equipped with a