Type of Enclosure?

I am curious what the name and what order my enclosure is.    I looked at the page on this site and it looks like a three chamber single reflex bandpass but reversed. on my box the middle port is sealed and the other two are ported.

I am planning on rebuilding my box to the same specs it is right now because the wood is bad in a couple spots. I want to know if the sound will change by doing this. Reason for this is it would be easier to build if I only had to make one port instead of two. Thanks.

I'll try at this question although I've never built a bandpass box.  The following pic:  is this similar to what you have?

The center chamber is sealed and provides an equal amount of air compression to both drivers.  All the sound comes from the ports.  Going by the descriptions on the enclosure page you referred to and on Brian Steele's site, it looks to me like this is also a 4th order.

The two ports in this example can probably be thought of as one single port because their tuning would be identical. Both chambers, port sizes and the sealed section behind the drivers are identical to each side.  The ports' responses will be summed.  Unlike an isobaric, you still have the SPL increase of using two drivers.

If what I say is not correct or is only partly correct, someone who knows more about it will chime in on this.  Meanwhile, before you rebuild just ask yourself one thing:  "Am I happy with the way this sounds?"  If the answer is Yes, rebuild to the exact specs of the original.  You can improve on wood thickness or type of material without changing the tuning as long as all on the inside is the same as the original.

-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

yes that is exactly what i have and it does sound good so thanks for the help.