How much clearance should be left around the Smartscan Hydra Head? Technical Support February 24, 2019 08:18 Follow Related articles How do you specify Smartscan Hydra? Can you install Automist Smartscan Hydra in a room with a hob or a woodburner or stove? What height are the Smartscan Hydra heads mounted? What precautions have been taken to prevent obstructions from blocking the spray? Does Smartscan Hydra meet the British Standard? Comments 0 comments Please sign in to leave a comment.