StacksVerified U.S. regulatory reference

40 CFR §1065.248

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Application. You may use a gas divider to blend calibration gases.
  2. (b)Component requirements. Use a gas divider that blends gases to the specifications of § 1065.750 and to the flow-weighted concentrations expected during testing. You may use critical-flow gas dividers, capillary-tube gas dividers, or thermal-mass-meter gas dividers. Note that your overall gas-divider system must meet the linearity verification in § 1065.307.