Digital BW, The Print

I'm using one of Paul's 100% carbon printing processes on matte papers
to make prints to decorate the house.  Getting decent anti-reflective
glass is very expensive and since the lighting isn't controlled
(mostly windows and such, but no direct sun light) glare is awful
behind glass.  So I'm thinking of displaying them framed and matted
without any glass.

Anyone see a major problem with this?

I know this is not archival, but I'd presume I'd change out the prints
every few years anyway.

Hit them with compressed air to get dust off every so often?

Should I spray the prints with something to protect them?

Any advice greatly appreciated!

Thanks,

  Ken