If appropriately designed a strainer or leaf filter is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged preventing any water flow.
Roof drain cover strainer.
Roof drains parts accessories floor drains.
The strainer has a lower profile than a dome shaped strainer which will prevent a high debris build up around the strainer.
Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.
As you have read a strainer is an important part of a drain system.
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This video explains the principle of a drain basin.
Replaces most popular 12 inch od drain domes 14 15 inch drain bowl for roof drains.
Smith 4915 square or rectangular frame with secured cover.
This part of the roof was lowered so if debris collects around the strainer water could still flow over its top and down the drain.
12 1 4 inch od x 7 inches high self locking.
Bleiou 304 stainless steel drain outdoor roof anti blocking line cap round floor net cover drainage floor line leak gutter guard filter strainer cleaning tool 4 inch 4 5 out of 5 stars 10 17 99 17.
Plastic utility pan.
12 1 4 inch od x 7 inches high self locking.
12 inch cast iron drain dome strainer.
Replaces most popular 12 inch od drain domes 14 15 inch drain bowl for roof drains.
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Josam 30000 st h floor drain with round nikaloy strainer and secured hinged grate.