10 In. X 3-1/4 In. to 5 In. Stack Boot

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3.25 In. X 10 In. X 5 Ft. Half Section Rectangular Stack Duct

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Stack Boot Rectangular Duct Galvanized Steel Durable 10 In. X 3-1/4 In. to 5 In.

Stack Duct Starting Collar Rectangular 3-1/4" x 10" 911433 - Bent

3.25 In. X 10 In. X 5 Ft. Half Section Rectangular Stack Duct

3.25 In. X 14 In. X 5 Ft. Half Section Rectangular Stack Duct