place it as far from the air handler as possible to minimize turbulence

and AL-185 models

Delay on Break

Built with laminated magnet construction and an untaped coil

Zonefirst SPRD-20X12 Damper 30067439-890 place it as far fromThe Zonefirst SPRD 20X12 is a professional grade barometric static pressure regulating damper designed for precision airflow management in multi zone residential and light commercial HVAC systems. Constructed from heavy duty 22 gauge galvanized steel, this 20" x 12" rectangular bypass damper utilizes a single blade, counter balanced weighted arm mechanism to maintain optimal duct static pressure. As zone dampers close, the SPRD 20X12 automatically