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Mechanical Rough-In Inspection Checklist
Section 1: Mechanical Rough-In Inspection Checklist
1. 1. Does duct-to-ground have a minimum 4-inch clearance?
Yes
No
N/A
2. 2. Is the duct in or under concrete encased by concrete a minimum of 2 inches thick?
Yes
No
N/A
3. 3. Do round ducts have crimped joints lapped a minimum of 1 inch and fastened with (3) sheet-metal screws or rivets equally spaced around the joint?
Yes
No
N/A
4. 4. Are joints, seams, and fittings of ducts sealed with mastic or other approved means?
Yes
No
N/A
5. 5. Is flexible duct supported according to the manufacturer's specifications?
Yes
No
N/A
6. 6. Are metal ducts supported every 10 feet minimum ?
Yes
No
N/A
7. 7. Is ductwork not displacing the required insulation of walls, floors, or ceilings, and are building cavities not used as ducts?
Yes
No
N/A
8. 8. Is the venting system not extending into or passing through any fabricated air duct or furnace plenum?
Yes
No
N/A
9. 9. Is return air taken from a room or space not greater than the flow rate of supply air delivered to a room or space? (M1602.2, Item 2)?
Yes
No
N/A
10. 10. Is return air ensured that it is not taken from a closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room, unconditioned attic, or other dwelling unit? Are dedicated systems serving only a garage have obtained return from the garage served? Does return air not discharge from one dwelling unit to another dwelling unit?
Yes
No
N/A
11. 11. Are return air inlets ensured they are not located within 10 feet of any fuel-burning appliance firebox or draft hood located in the same space?
Yes
No
N/A
12. 12. Is minimum return, air transfer openings, and duct size in accordance with appliance or equipment manufacturers’ installation instructions; Manual ”D”; or by a Registered Design Professional? (Forced air furnaces minimum outside, return air, openings 2 square inches/ kBtu/ hr. (Electric Heat pumps per UL 1995)).
Yes
No
N/A
13. 13. Do Ducts not displace exterior insulation of walls, floors, or ceilings and is it ensured that building cavities are not used as ducts?
Yes
No
N/A
14. 14. Do venting systems not extend into or pass through any fabricated air duct or furnace plenum?
Yes
No
N/A
15. 15. Are ducts, boots, and connectors used for heating or cooling insulated to at least R-8 in unconditioned spaces ?
Yes
No
N/A