10 CFR § 429.29 - Showerheads.

§ 429.29 Showerheads.

(a) Sampling plan for selection of units for testing.

(1) The requirements of § 429.11 are applicable to showerheads; and

(2) For each basic model of a showerhead, a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of water consumption of a basic model for which consumers favor lower values shall be greater than or equal to the higher of:

(i) The mean of the sample, where:

x = 1 n i = 1 n x i and, x is the sample mean; n is the number of samples; and x i is the i th sample;

Or,

(ii) The upper 95 percent confidence limit (UCL) of the true mean divided by 1.05, where:

U C L = x + t . 95 ( s n ) And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t 0.95 is the t statistic for a 95% one-tailed confidence interval with n-1 degrees of freedom (from Appendix A).

(b) Certification reports.

(1) The requirements of § 429.12 are applicable to showerheads; and

(2) Pursuant to § 429.12(b)(13), a certification report shall include the following public product-specific information: The maximum water use in gallons per minute (gpm) rounded to the nearest 0.1 gallon, the maximum flow water pressure in pounds per square inch (psi), and a declaration that the showerhead meets the requirements of § 430.32(p) pertaining to mechanical retention of the flow-restricting insert, if applicable.

[76 FR 12451, Mar. 7, 2011; 76 FR 24771, May 2, 2011, as amended at 78 FR 62985, Oct. 23, 2013]

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