Large inverted roof drain assembly 320mm flat grating threaded outlet
Frost Roof drain assembly - inverted roof heavy adjustable 320mm grating square, large cast-iron sump body with vertical outlet size 4' BSP. Rainwater outlets with flat gratings are suited to inverted roof construction where the waterproof membrane is located above the roof deck but below the insulation layer.
Analytical Flow Rate based on 35mm head of water (L/s)
3D CAD File
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