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A deep seal trap is specifically designed for situations where a trap cannot be vented. This is because venting is crucial for maintaining the proper drainage flow and preventing sewer gases from entering the living spaces. In applications where a trap is not vented, the deep seal trap serves to provide a sufficient water seal to prevent the backflow of sewer gases while accommodating the potential siphoning effects caused by a lack of ventilation.

Using a deep seal trap, which has a greater water seal depth than standard traps, helps in minimizing the risk of trap siphoning when there is a change in pressure or flow due to the absence of venting. This is essential for maintaining sanitary conditions and ensuring that the trap remains effective in its function.

In scenarios involving high flow rates, conventional traps can still operate effectively with proper venting mechanisms in place, and the material used (like PVC) does not necessarily mandate a deep seal trap. Proper venting usually mitigates the need for a deep seal unless specific conditions indicate otherwise.