Automatic radiator air vent CALEFFI AERCAL 1 1/4" right-side connection

CALEFFI AERCAL automatic radiator air vent with a 1 1/4" right-side threaded connection is designed to continuously remove trapped air from radiators and heating circuits. The device maintains hydraulic efficiency, reduces noise caused by air pockets and helps minimise corrosion by preventing oxygen accumulation. It is intended for installation on radiator outlets or return lines where a right-side 1 1/4" fitting is used, and is suitable for both residential and commercial heating systems that accept this size.

Advantages

The automatic air vent operates without manual intervention, discharging accumulated air automatically and maintaining steady system performance. Its right-side 1 1/4" threaded connection provides straightforward mechanical compatibility with standard piping and radiator outlets. By reducing trapped air, the valve contributes to quieter operation, improved heat distribution and decreased risk of corrosion-related damage in closed heating circuits.

Suitable for

• Removing air from radiator outlets and return lines
• Residential central heating systems with 1 1/4" fittings
• Commercial heating circuits compatible with right-side threaded vents
• Maintenance and retrofit projects where automatic air elimination is required

Key specifications

• Connection type: right-side threaded 1 1/4"
• Function: automatic air release for radiators and heating circuits
• Installation location: radiator outlet or return line
• Suitable systems: closed central heating systems (residential and commercial)
• Operation: automatic discharge of trapped air without manual venting

How to use

Install the AERCAL air vent on the designated radiator outlet or return line with the right-side 1 1/4" threaded connection, ensuring threads are clean and compatible sealing material is used according to pipework practice. After installation, venting occurs automatically during normal system operation; no regular manual intervention is required. Periodically inspect the vent for correct seating and absence of leaks, and follow general heating-system maintenance schedules to verify overall performance.

Usage recommendations

Use compatible thread sealant or tape when fitting the valve, avoid over-tightening to prevent damage to threads, and ensure the vent is accessible for inspection. Where system water quality is poor or contains debris, consider installing appropriate filters or strainers upstream to prevent blockage of the vent mechanism.