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Photo on left shows American 1213 B Regulator with Meter Bar Skirt installed, completely encased in ice. The assembly was maintained at 15 ° Fahrenheit. Water was poured onto unit to represent roof gutter run-off. Pressurized water was sprayed at and around unit to represent freezing rain.
Photo below shows the relief vent and surrounding area clear of any blockages. The surface area of the vent has been increased from 1 square inch to 15 sq inches. |
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