20 Inch Dampers

What’s available in 20 inchUse this page to shop our dampers by duct size: everything we sell in 20 inch is gathered here, including intumescent fire blocks and multi-leaf volume control dampers.Alpha Air is a Leicester-based supplier of commercial and industrial ventilation equipment. Order stocked lines by 3pm and they ship for next-working-day delivery.Alpha Air Ventilation Supplies is a Leicester-based supplier of commercial and industrial ventilation equipment, serving trade and business customers across the UK.