RadonAway RSA1 Radon System Alarm — ANSI/AARST Compliant

The RSA1 is RadonAway's vacuum-sensing system alarm — the simplest way to know if your radon mitigation system is doing its job. Mounts directly to the vent pipe, listens for the suction the fan creates, and sounds off visually and audibly the moment the fan fails or the system loses pressure.

Why every mitigation system needs one

A radon fan running quietly above the ceiling is invisible until you stop and check. Most homeowners forget to check. The RSA1 makes the system tell you when something's wrong instead of waiting for the next radon test to find a multi-month exposure.

Features

• Visual + audible alarm when system vacuum drops
• Pipe-mount or wall-mount — fits 2", 3", 4", and 6" pipe directly, or use flexible tubing for wall installs
• Adjustable delay: 48 hours / 7 days / 30 days before alarm triggers — ignores brief pressure transients
• Hush + test buttons for verification and quiet acknowledgment
• Battery-operated, battery included — 2-3 year battery life
• Pre-formed elbow design for fast installation on existing systems
• Meets current ANSI/AARST Radon Mitigation Standards for active soil depressurization system monitoring

Specifications

• Part number: 28535
• Power: Battery (included, 2–3 year life)
• Sensor: Vacuum sensing
• Pipe compatibility: 2", 3", 4", 6" direct mount; flat surface mount with optional tubing
• Standards: ANSI/AARST

Pair with

For visual confirmation of negative pressure beneath the slab, add the RadonAway Easy Read U-Tube Manometer — the alarm catches fan failure, the manometer catches gradual pressure drop.