Use LSP roof drain pan when you are working on a project with a large surface area such as commercial, industrial, institutional applications.
When your blueprints or specs call for the use of a 15″ single roof drain, use LSP sump pan.
When you have approx 13″ of vertical clearance between the roof and ceiling, if there is one.
When your roof joists are 24″ on center and you have 22″ of clear horizontal space.
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