Breathable Wall 42 inch x 42 inch: w/Flush Mount Frame 4' x 4' (a) a simple opening is

(a) a simple opening is needed in an exterior wall

The pre-filters double the filter life

Female x Male Threaded Connection: The 3/4" regulator features a female x male threaded connection

cleanest cut in the industry

Inert Ingredients (99% Total)

Breathable Wall 42 inch x 42 inch: w/Flush Mount Frame 4' x 4' (a) a simple opening isRigid Breathable Blackout Material, You can Build with! What is a breathable wall? Used in indoor grow rooms and greenhouse for Light Deprivation, the Breathable Wall is rigid product that allows zero light to pass throught ventilation holes (exhaust and intake) while allowing full air flow. (a) a simple opening is needed in an exterior wall, OR a shared wall between two grow rooms spaces (D) The Breathable Wall can also be installed directly to the