GrowBright 4″ Duct Filter
Improve air quality in the grow area with GrowBright duct filters, a simple dust and small particulate filtration elastic cover for air intakes.
• Dust & small particulate filter for 4″ round duct/flange air intakes
• Low restriction dual-layer design
• Outer bug/larger-particle screen layer
• Inner activated-carbon-lined smaller-particulate layer
• Fits over standard 4″ round ducting/duct flanging