Hoffman 74 Air Vent

The Hoffman 74 Air Vent is a thermostatic float air vent designed for boiler water lines. It automatically vents trapped air to improve efficiency, optimize heat transfer, and prevent noisy operation in hot-water or steam systems.

Best suited for boiler feed lines, the unit supports inlet sizes of 1/2 inch and 3/4 inch, with flexible inlet connections available as female threaded and male threaded straight shank fittings. The non-adjustable port provides reliable, maintenance-free air release, and a 35 PSIG pressure rating matches common boiler service conditions. Thermostatic action adapts to changing temperatures for reliable venting, while the compact design eases installation in tight spaces. Ideal for both new and retrofit boiler installations, it resists mineral buildup and maintains consistent venting performance in challenging environments.

Media Handled: Air. Application: Boiler Water Line.

• Type: Float, Thermostatic auto-venting for reliable air release.
• Inlet Size: Supports 1/2" and 3/4" lines for versatile installation.
• Inlet Connections: Female Threaded and Male Threaded Straight Shank options.
• Port Type: Non-Adjustable for consistent flow and maintenance-free operation.
• Pressure Rating: 35 PSIG maximum working pressure for typical boiler systems.
• Media Handled: Air, designed to vent trapped pockets without affecting water flow.
• Application: Optimized for Boiler Water Lines, improving efficiency and reducing noise.