We have not performed the necessary testing to legally acquire either a "waterproof" or "water-resistant" designation for our components. However, both our controller and blower have performed without issue when exposed to normal weather conditions.
If extreme weather conditions are expected or experienced during cooks, we have had FB400 users fashion an aluminum foil "tent" over and around the FB400 controller and blower housing to prevent wind and rain from infiltrating the blower and air intake vent. Assure when placing the foil "tent" to not block the space around the metal wind guard to allow air to enter the blower fan.
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