Item #3940BK High temperature 4" duct grille. This grille can be used in all hot air heating systems. Screw holes are hidden behind snap off grill. Can be adapted to 3" with a 001-088P.
These warnings are not an indication that these products are violating any safety standards or regulations.
However, as our products might be sold in the state of California, we are legally obliged to inform customers about the potential presence of these chemicals in our products.