DAMPERS EXTRUDED ALUMINUM DAMPERS EXTRUDED ALUMINUM DAMPERS EXTRUDED ALUMINUM DAMPERS WITH INSULATED BLADES EXTRUDED ALUMINUM DAMPERS WITH INSULATED BLADES & SIDE LINKAGE INSULATED EXTRUDED ALUMINUM DAMPERS STEEL DAMPERS STAINLESS STEEL DAMPERS HEAVY DUTY STEEL DAMPERS STEEL DAMPERS STAINLESS STEEL DAMPERS HEAVY DUTY STEEL DAMPERS STAINLESS STEEL DAMPERS WITH INSULATED BLADES & SIDE LINKAGE ROUND DAMPERS ROUND DAMPERS ROUND DAMPERS STAINLESS STEEL (HIGH PRESSURE) ROUND DAMPERS (HIGH PRESSURE) BACKDRAFT DAMPERS BACKDRAFT DAMPERS (INSERTION TYPE) BAROMETRIC DAMPERS ROUND BACKDRAFT DAMPERS ROUND BACKDRAFT DAMPERS (ON CONTROL ARM)