Type MG-1 Galvanized Barometric Draft Control Size: 8"

The MG-1 provides precise accurate control of drafts at levels higher than permitted by a standard draft diverter, a frequent requirement with gasBecause it is double-acting, iit opens out to relieve positive vent system pressures as low as .001""Draft adjustments using weights are simple and accurate from .01 to .1""The MG-1 has stainless knife edges, self-aligning bearings and a deeply recessed gate for greater accuracy, sensitivity and dependabilityThe formed steel ring, extended collar and precisely balanced gate are alll made of heavy gauge materialNominal Capacity for 4MG-1 - 12.6 Sq. In. Recommended Pipe Size for 4MG-1 - Dia. 3-4, Circum. 9-1/2"" to 12-1/2""Nominal Capacity for 8MG-1 - 50.3 Sq. In. Recommended Pipe Size for 8MG-1 - Dia. 7-8, Circum. 22"" to 25-1/4""