A railing with a grill that permits unrestricted airflow should be preferred when choosing one for the balcony. An attractive grill is preferable to a brick wall. Glass in the grill is not only fashionable, but Vastu specialists also advise it. Make sure there is enough room for the air to go through. Also, make sure the balcony grill, if it's constructed of metal, is kept in good condition and doesn't rust.