Bilco 36" x 30" Aluminum Cover with Galvanized Steel Automatic Smoke Vent MSRP: $4,469.08 Now: $3,192.20 Add to Cart Compare Bilco 72" x 72" Aluminum Automatic Double Leaf Smoke Vent Compare Bilco 72" x 72" Aluminum Cover with Galvanized Curb Automatic Double Leaf Smoke Vent Compare Bilco 66" x 66" Aluminum Automatic Double Leaf Smoke Vent Compare Bilco 66" x 66" Aluminum Cover with Galvanized Curb Automatic Double Leaf Smoke Vent Compare Bilco 66" x 144" Aluminum Automatic Double Leaf Smoke Vent Compare Bilco 66" x 144" Aluminum Cover with Galvanized Curb Automatic Double Leaf Smoke Vent Compare Bilco 60" x 96" Aluminum Automatic Double Leaf Smoke Vent Compare Bilco 60" x 96" Aluminum Cover with Galvanized Curb Automatic Double Leaf Smoke Vent Compare Bilco 60" x 84" Aluminum Automatic Double Leaf Smoke Vent Compare Bilco