Description
Hoffman Specialty Model 4-A Adjustable Steam Radiator Air Vent
The Xylem-Hoffman Specialty 401413 Model 4-A is a trusted adjustable air vent engineered for one-pipe low-pressure steam heating systems. Designed to automatically purge air from radiators and steam mains, this vent allows steam to enter quickly and efficiently while closing tightly upon steam contact — maximizing system comfort and fuel efficiency.
Product Overview
The Model 4-A features an adjustable venting rate, making it ideal for balancing heat distribution across multiple radiators in residential and light commercial steam heating systems. Its durable construction and reliable thermostatic operation have made it a go-to choice for HVAC professionals and plumbing contractors for decades.
Key Features
- Adjustable venting rate for precise system balancing
- Thermostatic operation — closes automatically when steam arrives
- Ideal for one-pipe low-pressure steam heating systems
- 1/2″ female inlet connection for standard radiator tapping
- 3/4″ male outlet connection
- Rated for 2 PSI (low-pressure steam) systems
- Durable, long-lasting construction for reliable performance
Specifications
- SKU: 401413
- Model: 4-A
- Inlet Connection: 1/2″ Female
- Outlet Connection: 3/4″ Male
- Maximum Operating Pressure: 2 PSI
- Application: One-pipe low-pressure steam radiator systems
- Brand: Hoffman Specialty (Xylem)
Application
The Hoffman Specialty 4-A steam vent is designed for installation on steam radiators in residential and light commercial one-pipe steam heating systems. Proper air venting is essential for efficient steam distribution — trapped air prevents steam from entering radiators, causing uneven heating and wasted energy. The adjustable design allows technicians to fine-tune venting speed for optimal system balance.
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