Thermoflo Back Draft Damper Size:8 It contains levels of phosphorus

It contains levels of phosphorus and potash balanced specifically for robust flowers and increased essential oil production

indoors or outside

weighs 3 poundsBallast: 12

Waterproof poly film that is black on one side and white on the other can be used for growing areas

Suitable for both flowering and vegetative stages

Thermoflo Back Draft Damper Size:8 It contains levels of phosphorusBenefits of the Backdraft Dampers Specifically designed to be used with ThermoFlo flexible ducting Designed to allow airflow in one direction Minimum air leakage design Aluminum spring loaded backdraft damper blades 20 gauge steel housing Simple installtion entire assembly inserts into duct Can be installed in any position Designed for vertical or horizontal mount Exterior foam gaskets assure a tight seal