That's the exact frequency of that note so that would work lol. If that's about as low as you listen to you could tune higher, though. Tune the box to 35+ and you will still have plenty of high end. Even if you tuned to 35 or something along those lines, you shouldn't have a problem playing down to 28hz or so (the low note in put on, for example)
So I was talking to the local guy who does boxes here in the Tacoma area and he mentioned to me that these subs only like round ports and require their own chamber and ports. Do some subs actually want this? He isn't charging anything extra for a box like this, it was just something he said about them.