Dranjer products let water flow into sumps and floor drains—but they seal out radon, insects, and odors coming from the sub-floor area. They are passive, require limited maintenance, and they last a lifetime. It’s a cost effective step in radon reduction for your home.
Suitable with ASD Systems
F Series Dranjer products are specifically designed for use with residential Active Sub Slab Depressurization (ASD) installations.
J Series Dranjer products also protect when used with most ASD.
The valve in J Series 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 J Series Dranjer from the protected space into the sump pit or weeping tile system and then to the ASD fan. In these applications, we recommend installing an F Series Dranjer. They offer greater resistance to depressurization 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.