UL 1479-2015 pdf download

UL 1479-2015 pdf download.Fire Tests of Penetration Firestops.
7.4 Test setup
7.4.1 The test sample is to be installed in or against the test chamber. The same test sample to be used for the Fire Exposure Test, Section 5, can be used for the Air Leakage Test. prior to the Fire Exposure Test.
7.4.2 The outer penrneter of the test sample is to be sealed to the chamber wall. Nonhardening mastic compounds or pressure-sensitive tape can be used to seal the test sample at the chamber opening, to seal the access door to the chamber, and to achieve air tightness in the construction of the chamber. Rubber gaskats with clamping devices can also be used for this purpose.
7,4.3 Each penetrating item containing hollow spaces, voids or passageways through which air can leave the chamber shall be sealed on the ends of each penetrating item to prevent the passage of air through the penetrating item.
7.5 Extraneous chamber leakage requirements
7.5.1 Prior to the ambient temperature air leakage test. the extraneous chamber air leakage rate (O) is to be measured using an air-impermeable sheet to cover the test sample mounted on the test chamber at the air pressure differential to be applied dunng the air leakage test. The extraneous chamber air leakage rate (Q) is to be measured prior to the ambient temperature exposure tests specified in 7.6,2 and after the elevated temperature exposure tests specified in 7,7,1. The extraneous chamber air leakage rate measured alter the elevated temperature exposure tests (OLe) Is to be measured after the temperatures at the faces of the test sample have returned to 75 ±20°F (24 ±11 °C) at the air pressure differential applied during the air leakage test.
7.5.2 The extraneous chamber leakage shall be measured by means of a rotamneter or equivalent air flow meter. The device shall have a measurement resolution better than 3% of the measured value.
7.5.3 For the air leakage tests to be acceptable, the value of Q shall be within ±10% of 0L.a’
7.5.4 Should the air leakage test be conducted only at ambient temperature, the value of shall be determined after the air leakage test at ambient temperature.
7.6 Ambient temperature exposure tests
7,6.1 Prior to the conduct of the ambient temperature exposure test, the air-impermeable sheet used for extraneous leakage measurement shall be removed from the test sample without disturbing the seal between the test sample and the test chamber.
7,6.2 The chamber temperature is to be 75 ±20°F (24 ±11°C). The air flow into the test chamber is to be adjusted to provide a positive test pressure differential of 0.30 ±0.01 in water (75 ±2 Pa) between the test chamber and the space immeckately outside the test chamber. Alter the test conditions are stabilized, the airflow rate through the air flow metering system and the test pressure differential are to be measured and recorded. This airflow rate is designated the total metered air flow (OMa) at ambient temperature. When required by codes, other test pressure differentials shall be permitted to be used.
7.7 Elevated temperature exposure tests
7.7.1 The test chamber temperature is to be 75 ±20°F (24 ±11 °C) prior to the conduct of the test. The test chamber temperature shall be unitormly increased so that it reaches 350°F (177°C) within 15 mm and 400°F (204°C) wilhin 30 mm. The chamber temperature shall be stabilized at 400 ±10°F (204 ±5.6°C). Then, the airflow into the test chamber shall be adjusted to provide a positive differential of 0.30 ±0.01 in of water column (75 ±2 Pa) between the test chamber and the space immediately outside the test chamber. Alter the temperature and pressure differential are stabilized within the above tolerances for a period of at least 5 mm, the airflow rate through the airflow metering system and the pressure differential shall be measured and recorded. This airflow rate shall be designated as the total metered rate (Q) at elevated temperature. When required by codes, other test pressure differentials shall be permitted to be used.
7.8 Recorded test data
7.81 The barometric pressure, temperature, and relative humidity of the supply air are to be measured at the test sample and recorded. The supply air flow values are to be corrected to standard temperature, humidity and pressure conditions of 68°F (20°C), 50% relative humidity and 29.92 in Hg (101.325 kPa) for the purpose of determining and reporting the air leakage rates.
7.8.2 The ambient air leakage rate of the test sample (LA) shall be determined by subtracting the extraneous chamber air leakage chamber air leakage rate (OLa) from the total metered airflow rate (OMa).
7.8.3 The elevated temperature air leakage rate of the test sample (LE) shall be determined by subtracting the average extraneous chamber air leakage rate L(O + O.)/2J from the total metered airflow rate.