Watts 0067450 Valve 321142 301 this industrial HVAC fan blade this industrial HVAC fan blade provides the exact dimensions required for seamless installation and peak thermal performance in large scale Reznor heating units Its robust construction and precise calibration make it a standard OEM replacement part for ensuring HVAC system safety and compliance with operational pressure limits This valve is rated for saturated steam at 15 PSI (approximately 250°F) and hot water applications up to 60 PSI the angle pattern and 1 2" FIP inlet are specifically designed for radiator supply in standard low pressure steam configurations where air and condensate handling are critical