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Gentlemen, Many of us have gone into Building Operations after leaving "the Sea". May I suggest that following the Bush Fires and vast amounts of smoke with small particulate,
give some thought to your Filters.
The last hospital I worked in before retirement was out in open countryside, and we only planned filter changes once a month.
A new hospital was built nearby, and demolition of the old Victorian hospital commenced.
At its height, I was having filters changed almost daily on the vent plants nearest to it.
And they were very dirty.