In the illustration shown, the type of ventilation depicted in figure 1 and figure 2 respectfully is __________. See illustration SF-0013.
⢠Compare direction of air and smoke movement in each figure (mostly across the deck vs. mostly up and down). ⢠Know basic definitions: horizontal ventilation moves smoke laterally through openings on the same level; vertical ventilation moves it up or down through decks or topside openings; combination ventilation uses both. ⢠Look for any mechanical exhaust fan or trunk that might be pulling smoke vertically while air enters horizontally.
⢠In Figure 1, trace the white and red arrows: Do they show smoke and air only moving along one deck, or do they also pass up or down through another level? ⢠In Figure 2, ask yourself whether the smoke is mainly being drawn across the deck toward an opening on the same level, or if it is also using an opening above/below the fire compartment. ⢠Which option best matches a setup where air is brought in one way and smoke is removed another way (two directions), versus a setup where smoke is mainly swept across on a single level?
⢠Identify whether Figure 1 uses both horizontal and vertical paths for smoke removal or just one direction. ⢠Confirm that in Figure 2 the primary exhaust path for smoke is along the same deck level, not up through a higher deck opening. ⢠Eliminate any option that labels a figure as vertical ventilation when the arrows do not clearly show smoke moving primarily through an opening above or below the compartment.
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