ProVent Systems Inc.
1355 Capital Circle
Lawrenceville, GA, 30043

Tel: 800-262-5355
Fax: 770-339-1784

Sound Testing of Whisper Quiet Shell Pipe™
Comparative Sound Testing of Cast Iron and PVC Stacks

Noise from DVW pipes in a wall cavities adjacent to living rooms, dining rooms and bedrooms can be annoying when waste water is discharged into the drain pipe from upper floors. In the past, the only sensible option to reduce sound was to use cast iron in place of PVC plastic pipe.

We developed a different solution; a variation on standard PVC piping which will also fit inside a plumbing wall. We performed comparative sound tests with ProVent Shell Pipe, cast iron and standard PVC piping, keeping everything constant except the type of pipe. As sound engineers know, it is difficult to reliably test the soundproofing qualities of different types of piping because a small change in the environment or in attaching or securing the pipe can change the test results.

In order to evaluate the soundproofing capabilities of ProVent Whisper Quiet Shell Pipe™, we tested each type of pipe by flushing the same 1.6 GPF bottom outlet water closet within the same mounting frame and using the same attachment method for each type of pipe. 

See the photographs and tables, below, for surprising results.

To VIEW A VIDEO of the sound testing, please click here.

Sound tests were performed in order to detect the actual sound difference between:

The noise levels recorded were:

These results are not as close as they appear. A level of 70dB has 10 times the noise intensity of a level of 60dB. These results indicate that the bare PVC pipe registered over 8 times the noise level of the ProVent Whisper Quiet Shell Pipe™ and that the cast iron pipe registered over 3 times the noise level of the ProVent Whisper Quiet Shell Pipe™.

While we expected the Shell Pipe to outperform the PVC pipe, the fact that it outperformed the cast iron was a complete surprise since cast iron has always been known and advertised as the “quiet” pipe. 

Whisper Quiet Shell Pipe™ (US Patent Pending)

The Shell Pipe is available in 10 foot lengths, will fit into regular wall cavities and can be cut to accommodate any length of regular PVC pipe where water noise could be an issue.

The Shell Pipe halves are glued onto Spacer Rings, which enclose the pipe, providing an air space for enhanced sound proofing.

There is a large space between the ceiling and the PVC pipe and fittings installed inside the drop ceiling area and, therefore, they shouldn’t contribute significantly to water noise.