Answers

Mechanical Codes Quiz Answers


  1. A permanent means of access must be provided where equipment is installed

on roofs or structures exceeding 16 feet.


  1. A 100,000 btu gas furnace and a 40,000 btu gas water heater are located in a basement area that measures 20’x25’x8’. Is there adequate combustion air available from within the space to comply with code requirements?


Answer: No, it is not adequate. Equipment in a confined space requires 50 cubic feet of combustion air per 1,000 btuh fired. We have 140,000 btuh. Therefore, we need 7,000 cubic feet of air in the space. The volume of the 20’ x 25’ x 8’ basement is only 4,000 cubic feet.


  1. When appliances are located in an attic, they can be no more than 20 feet from the access opening.


  1. Mechanical equipment should not be located within 10 feet of a roofs edge

unless an approved railing is provided.


  1. The maximum hanger spacing for horizontal PVC pipe is 4 feet.


  1. Supports for metal ducts must not exceed intervals of 10 feet.


  1. Appliances located in an attic must have a level service space on the service side of the equipment not less than 30 inches x 30 inches.


  1. Fresh air intakes (including economizers) must be a minimum of 10 feet from building exhaust, flues, and plumbing vents unless such vents extend 2 feet above the intake opening.


  1. Horizontal vents on condensing furnaces must terminate a minimum of 1 foot above, or 4 feet below or horizontal from any doors or windows.


  1. The volume of a space in which appliances are located is insufficient to provide adequate combustion air. There is sufficient air available from an adjacent space.

How many openings are required to provide combustion air from the adjacent space?


Answer: Two

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