Rollup weather doors Sample Clauses

Rollup weather doors. The rollup weather doors are meant to provide most of the necessary weather protection for the dome interior and to carry, possibly with the addition of internal bracing, loads associated with wind, snow and ice. The secondary use of the weather doors will be to provide gating of air flow when a vent faces directly into the wind. 1.2.1 The vent units, and the roll-up doors in particular, when fully closed, shall withstand wind speeds up to 125 mph at all dome orientations without damage or substantial leakage of wind-driven precipitation. When closed, Rollup weather door mechanisms must withstand effects of the following maximum structure design live loads applied to the rollup doors: - 79 lbs per sq ft wind load acting radially outward from dome center - 58 lbs per sq ft wind acting in any horizontal direction - 30 lbs per sq ft ice load uniformly distributed acting vertically downward (per CFHT Mechanical Engineering Design Criteria, Shutter Mechanisms, p 7 – S.N.C. – 1975) 1.2.2 In operation, vent rollup door positions will be moved between any of 4 positions (fully open, 2/3 open, 1/3 open, fully closed) throughout the night as the individual vent-to-wind angles change several times each hour between sunset and sunrise. Very little operation is expected during daylight hours during which the vent doors will normally be closed.
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