Roof ventilators are available in following sizes and customized Material of construction as per client requirement: SS316 / SS304 / SS202 / MS duly electroplated / Aluminum. Throat Dia: 21 inch | Ventilator Dia: 28 Inch | Number of Fins: 36 Throat Dia: 24 inch | Ventilator Dia: 31 Inch | Number of Fins:42