95% turn CCW at least in my neck of the woods. But it pays to check. Sucking all the AC through the serving window should makes the cooks happy. Look around the edge of the walls where the drop ceiling meets it. V shaped tracks where air is being sucked in. Don't even talk about the back draft on a gas water heater unless it's in a truly sealed room in the restaurant. If the plumbing is overhead you will get frozen pipes in some places. Some hoods have no make-up air ducts in them so all of it has to be dumped into the kitchen. Then there is the problem of knocking the air curtain out of the new style sandwich box. Restaurants, what a mess.
Be safe not fast. body parts don't grow back