Common Questions What is the difference between 042N4230 and 042N4221

As a 24V AC solenoid coil

What causes a steam vent to hiss or leak water

With a maximum working pressure of 680 PSIG

A yellow hue indicates high moisture content

Zonefirst SPRD-9 Damper Els PW 17895 Common Questions What is theThe Zonefirst SPRD 9 is a professional grade 9 inch round barometric static pressure regulating damper engineered for precise HVAC bypass management in multi zone systems. This mechanical, non electrical component utilizes a weighted counter balance arm to automatically relieve excessive static pressure as individual zone dampers close. When the air pressure in the supply plenum exceeds your calibrated setpoint, the damper blade opens to bypass air