Precision Custom Sheet Metal. has specialized in the production of duct work for furnance for 20 years in the GTA area. WE carry a full line of stock for you. 3 up to 14 duct work Large selection of; reducres increaser round stock filtings Our large selection always your order to be ready that same day. Delivery service. Available upon request(subject to a change) shop around for your order of duckwork. Than make precision custom sheet metal. Your final call and you'll know it should have been your only call. more... See more text