AC Infinity Backdraft Damper Ducting Insert - 100mm (4 inch) Black Galvanised Steel fan-controllers Pro Cal solves this issue

Pro Cal solves this issue with a readily available calcium source married with extra magnesium

Calcium is commonly used in the commercial cocopeat buffering process to improve cocopeat quality

Left - Right Rotation

The filter is available with or without an adjustable heater

AC Infinity Backdraft Damper Ducting Insert - 100mm (4 inch) Black Galvanised Steel fan-controllers Pro Cal solves this issueA ventilation ducting tool designed for insertion into 4 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 galvanised 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 aluminium and are equipped with a