Why using inclined stand for exposing settle plates near to riser. Inclined stand mention or recmonded any guidelines.
Near risers plates are exposed in current of air to trap the microbes from the air to media and incline stands increase its possibilities. It is logical because below the riser level air will not contact the plate and you will get less colonies on plates. Everything is not given in guidelines a lot of things in pharmaceutical industries are based on audit findings and recommendations.