Mason-Grant is a technical consulting firm. Founded in 1986, we provide a wide variety of services, usually related to humidity control, moisture and drying in buildings and industrial processes. We are located on the New Hampshire Seacoast, about an hour north of Boston. To discuss a potential project or to ask questions within our subject areas, we invite you to call us at (603) 431-0635. Mason-Grant Consulting, Box 6547  57 South Steet, Portsmouth, NH 03802 USA.