Project Description
Dranjer FR2
Retrofit Floor Drain Seal
The FR2 Dranjer is a retrofit floor drain valve, specifically designed for homes using or planning to use Active Subslab Depressurization (ASD) systems for radon mitigation. It allows water to drain freely while preventing radon gas, soil gases, and odors from entering your home.
Key Features:
- Sealed Protection: Remains closed at pressures below 0.9” of negative pressure, ensuring effective radon control.
- Easy Retrofit Installation:
- Position the FR2 under the existing strainer plate.
- Insert the strainer plate with the FR2 back into the drain opening.
- Friction between the strainer plate, the Dranjer, and the floor ring secures the unit in place.
- Trim any excess rubber flange for a clean, seamless fit.
With its simple installation and reliable sealing, the FR2 Dranjer is a great solution for upgrading existing floor drains to enhance radon protection and indoor air quality.
| Specifications | Inches | Centimeters |
|---|---|---|
| Fits drain pipes larger than | > 2 | > 5.08 |
| Below Grade Depth | 3.25 | 8.255 |
| Below Grade Width | 1.7 | 4.318 |
| Flange Diameter | 8 | 20.32 |
How Your Dranjer F Series Works
F Series have a sealing ring that lifts when water enters the valve – allowing for the water to flow through the unit.
In a no flow environment, the sealing ring prevents radon gas from passing through or past the unit. This effectively reduces radon levels in the dwelling.
Dranjer products are engineered and laboratory and field tested. Dranjer products are DIY friendly. Dranjers are often installed in association with an ASD system but may be the only action you need to reduce your radon levels.
Suitable with ASD Systems
F Series Dranjer products are suitable for use with typical residential Active Sub Slab Depressurization (ASD) installations.
The valve in these Dranjer products will not open until static pressure across the Dranjer exceeds 0.75 inches of water column (185 Pa). Typically, ASD systems directly connected to sump pits or weeping tile systems operate below these pressures.
If ASD system suction pressure in a sump pit or weeping tile system does exceed these levels, some air will flow through the Dranjer unit, from the protected space into the sump pit or weeping tile system, and then to the ASD fan. In these applications, it is recommended F Series Dranjers are used. They offer greater resistance to airflow.
In most applications, air leakage through the Dranjer from the residence will have little or no impact on the effectiveness of the ASD system.
