Is a Peal n Seal envelope considered a self seal envelope?

Yes. Peel and seal is simply one of the many names for a self-seal envelope, so a Peel n Seal envelope is a self-seal envelope.

Self-seal envelopes go by a lot of names, but they all close the same way:

• Also called peel & seal, simple seal, strip seal, peel & stick, and zip seal.
• They seal with pressure only, no water or licking required.
• Peel-and-seal styles use a protective strip you remove before pressing the flap down.
• Great for high-volume mailings where speed and a secure close matter.