| Download | - View final version: Determination of critical air velocities to prevent smoke backflow at a stair door opening on the fire floor - 660 RP (PDF, 5.6 MiB)
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| Author | Search for: Tamura, G. T.1 |
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| Affiliation | - National Research Council of Canada
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| Format | Text, Article |
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| Subject | Smoke management; Indoor air |
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| Abstract | Tests to determine air velocities to prevent smoke backflow were conducted in the ten-story experimental fire tower of the National Fire Laboratory of the National Research Council of Canada. They were measured at the stair door opening on the fire floor for bum temperatures ranging from 150°F (65°C) to 1200°F (650°C) at an increment of 150°F (8JDC). The critical velocities ranged from 124 feet per minute (ft/min) (0.63 m/s) at 150°F (65°C) to 460 ft/min (2.34 m/s) at 1200°F (650 C). Some of the other parameters investigated resulted in decreases in the critical air velocity. These included venting either by exterior wall vents or an exhaust fan, and opening stair doors in addition to the one on the fire floor. Reducing the angle of door opening from 90° to 30° decreased the effective critical air velocities, compared to those at an area of the door opening at 90°, by 50 percent. There was no noticeable effect on critical air velocities when the method of pressurization of the stairshaft was changed from multiple injection to bottom injection. |
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| Publication date | 1992 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Identifier | IRC-P-3278 |
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| NRC number | NRCC 36031
NRC-IRC-4343 |
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| NPARC number | 20358880 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 4dc88871-0bf1-40d8-b458-b8928ec5642b |
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| Record created | 2012-07-20 |
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| Record modified | 2020-06-06 |
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