The new laser engraver requires a six-inch vent to extract the noxious fumes that are created while operating the machine. The more direct the path of the ducting, the more efficient the laser will run, so we decided to go straight from the machine through the wall. The thing is, the wall behind the laser is fourteen inches thick, eight of which are solid concrete. Rather than tackle this project ourselves, we put in a call to our friends at Groovin’ Gord, who specialize in coring, cutting and grooving concrete. They were super efficient and wasted no time setting up, drilling the seven-inch hole and then cleaning up perfectly when they were done - all in less than an hour. THANKS!