Ventilation hoods and devices, where installed, shall be designed to prevent grease or condensation from collecting on walls and ceilings, and from dripping into food or onto food-contact surfaces. Filters or other grease-extracting equipment shall be readily removable for cleaning and replacement, if not designed to be cleaned in place.
N.Y. Comp. Codes R. & Regs. Tit. 1 §§ 271-4.12