Zonefirst SPRD-12 Damper Els PW 17895 ensuring a drop-in fit for

ensuring a drop-in fit for older systems without requiring bracket modifications

including the LH33WZ515 and LH33WZ521

you will need to order a separate V-9999-608 packing kit

MAPP (MAP-Pro)

How do I test if the Reznor 136736 switch is faulty

Zonefirst SPRD-12 Damper Els PW 17895 ensuring a drop-in fit forModern forced air zoning requires precise management of air velocity to prevent equipment damage and audible noise. The Zonefirst SPRD 12 is a professional grade 12 inch round barometric static pressure regulating damper designed to bypass excess supply air directly into the return plenum as individual zone dampers close. Built with a heavy duty 22 gauge galvanized steel shell, this single blade unit utilizes a counter balanced weighted arm to