Home » Agri-Aide Ventilation » Agri-Aide Shutters » Shutter 21″ Shutter 21″ SKU: KV-PS0021 Availability: Available Description Shutter PVC, fits 16″ SW fan with 21″ opening, stock size Related products Shutter 18″ Learn More Shutter 15″ Learn More Shutter 40″ Learn More Shutter 14″ Learn More