Results 1 - 24 of 137 Honeywell ZD10X10TZ. 10" x 10" Side Mount Automatic Zone Control Damper. $149.99. Not In Stock. Or as low as. Add to Cart · (2 Reviews). The Aprilaire 6749 12" x 24" Rectangular Duct Damper (Side Mount) is a standard heating and cooling system that delivers air to the entire conditioned spaceThe MD25 Manual Balancing Damper has a 3" frame. It features: Easy installation. Becomes part of the ductwork. Galvanized steel construction. The DuroZone Multi-Blade dampers for residential zoning systems have strength without excessive reduction of free area inside the ductwork. DuroZone Pressure Relief Dampers are available in both rectangular and round configurations. Balancing & Regulating Dampers Quick Reference System BO-110H, Rectangular Remote Cable Operated for Cable to run inside duct, Bowden Remote