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What is the difference between Ventilated Transformers such as an EE15S3H and Sealed Resin Epoxy Encapsulated Transformers such as a 15S1F?

Issue:
Describe the differences between Epoxy encapsulated and feneral purpose ventilatedTransformers.

Product Line:
LV Transformers

Environment:
EX, EE, Buckboost, Resin encpsulated

Cause:
Various Transformer designs exist for use in different environments and applications

Resolution:
There is virtually no performance difference between equivalent kVA and voltage ratings. The difference however is mechanical and thermal.
Sealed Resin Epoxy Encapsulated Transformers are constructed using NEMA 3 R enclosures as standard (with NE MA 4 X available) . Mounting brackets are integral to the design. Sealed Resin Epoxy Encapsulated Transformer units have a 180 AC insulation with standard ACCORDANCE rise with an AC rise option .
Ventilated Transformers are rated NE MA 2. Adding the optional weather shield can provide a NEMA 3R rating. Mounting brackets are also separate.
Ventilated units utilize a 220C insulation system with 150C rise standard and 115C and 80C options.