Wall Mount Duct Shutter 4 - White Steel 4" Wall Mount Duct Shutter food-&-water-storage and with their 2000° Kelvin

and with their 2000° Kelvin color temperature they consistently provide intense light in the correct spectral range for vigorous flowering growth and can even be used

Big Boy™ extra high capacity de-chlorinator and sediment filter

3 Borosilicate glass

Product Measurements: 1 x 1 x 8 (inch)

But remember

Wall Mount Duct Shutter 4 - White Steel 4" Wall Mount Duct Shutter food-&-water-storage and with their 2000° KelvinA wall mounted shutter designed for use with grow rooms, dryers, attics, and other HVAC applications. Features built in rubber stoppers that dampen slamming vent blades and ensure complete blockage. Non return thin louvers that close when fan is not in use to prevent outside air and debris from entering. Durable, lightweight steel body that is rust resistant can withstand most weather conditions. Duct Opening Diameter: 4 inches Front Plate Size: 6. 69