Approved Vendors - Ductboard Collar, 8 in, 28 ga

Approved Vendors - Ductboard Collar, 6 in, 28 ga

Approved Vendors - Duct Board Collar With Ring, 7 in, 28 ga

Approved Vendors - Ductboard Collar, 12 in, 28 ga

Approved Vendors - Ductboard Collar, 9 in, 28 ga

Approved Vendors - Ductboard Collar, 14 in, 28 ga

Approved Vendors - Ductboard Collar, 5 in, 28 ga

Approved Vendors - Ductboard Collar, 10 in, 28 ga

Approved Vendors - Ductboard Collar, 16 in, 28 ga

Approved Vendors - Ductboard Collar, 18 in, 28 ga