"goatlip" wrote in message
ps.com...
Thanks Joseph. we've talked to one contractor and without removing some
of the slab it will be difficult. He claimed for each bend the vent
tube makes the diameter has to increas by an inch.

I'm still looking into different options. Is there other way of venting
besides a hood or down draft unit?? Seems like several 1" size tube
could be used to vent somehow. any ideas or suggestions?

why can't you put in a hood? perhaps that can be solved easier than breaking
your slab.