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 Shutters 24″ Learn More Shutter 19″ Learn More Shutter 38″ Learn More Shutter 25″ Learn More