Multi-Blade DamperCircular volume control dampers with multiple blades are used where there is no need for a high level of shut off. Manufactured from galvanised steel. External manual handle with several control settings. Male connections to fit inside spiral ducting. Square and rectangular multi-blade dampers also available - please enquire. SKU: Alph34Delivery date: 2-3 days Ducting Size *Please select100mm 125mm 150mm 200mm 250mm 300mm 355mm 400mm 450mm 500mm £0.00 Qty: Add to cart Custom wishlist OKAdd to wishlistAdd to compare listEmail a friend