Речь идет об очистителях воздуха. И об очищении очистителей

Most all small residential and light commercial electronic air cleaners are the washable type. Their purpose is to capture and hold all the contaminants removed from the airstream. When the collector plates became loaded with dust, the performance of the electronic air cleaner is reduced (this is frequently indicated in the form of arcing between oppositely charged plates), the power to the electronic air cleaner is turned off and the plates are removed and washed.

Commercial Automatic wash in place: The electronic air cleaner is built with a properly located manifold of overhead and/or upstream spray nozzles so that when cleaning of the plates is required, the power is turned off and the cleaning system turned on.

Первый абзац приведен ради контекста.
Затруднения - во втором.
А именно "properly located manifold of overhead and/or upstream spray nozzles"
Как это правильно сказать?