a filtered ventilating system for a cooking unit incorporates a hood emplaceable above a cooking unit . an exhaust stack extends from the hood for removing cooking fumes captured by the hood . a barrier wall divides the interior of the hood into inlet and outlet zones open to the cooking unit and exhaust stack , respectively , and is provided with a fume opening to receive a filter for grease and the like . wash down pipes respectively extend along the exhaust zone of the hood adjacent the filter and along an exhaust stack . a motor rotates the wash down pipes and a suitable supply provides wash liquid to the pipes , which are thus energizable to simultaneously rotate and spray the wash liquid onto adjacent hood , filter and exhaust stack surfaces for cleaning same . pivot and latch apparatus supports the filter for reversal on the barrier wall , to permit both sides of the filter to be cleaned by liquid from the wash down pipes .