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Are the doors on the NEMA 3R MH-WP enclosures gasketed?

Is there a gasket on the NEMA 3R panelboard enclosures such as the MH-WP boxes?  

Product line:  
NEMA 3R panelboard enclosures

MH-WP style panelboard enclosures

Yes, they have a gasket on the door which is required for them to be classified NEMA 3R.  
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