CCI Plumbing & Mechanical Systems 3

Question 1

Under the IMC, what is the minimum clearance required between a gas-fired furnace and combustible construction?

Accepted Answer

0 inches if listed for zero clearance

Answer

Appliances listed and labeled for zero clearance can be installed directly against combustible materials if installed per their listing and manufacturer instructions.

Question 2

Which venting method uses a single pipe that serves as both the supply air and the vent for a high-efficiency furnace?

Accepted Answer

Direct vent (two-pipe) system

Answer

A direct vent system uses two pipes: one to draw combustion air from outside and one to exhaust flue gases, making it a sealed combustion system.

Question 3

An inspector observes that a mechanical room housing a boiler has no means of combustion air. The correct remedy is to:

Accepted Answer

Install a make-up air louver or duct sized per code

Answer

Combustion air must be provided to fuel-burning equipment rooms via louvers, ducts, or openings sized according to the fuel input BTU rating per the IMC.

Question 4

What material is NOT permitted for use as a gas supply piping in residential construction per the IFGC?

Accepted Answer

PVC plastic pipe

Answer

PVC plastic pipe is not approved for gas supply piping; approved materials include steel, copper, CSST, and PE pipe in limited applications.

Question 5

What is the required minimum distance between a gas appliance vent termination and a window or door opening per the IFGC?

Accepted Answer

3 feet

Answer

The IFGC requires vent terminations to be at least 3 feet from any openable window, door, or gravity air inlet to prevent re-entry of combustion gases.

(CCI) Certified Construction Inspector Practice Test

(CCI) Certified Construction Inspector Practice Test

CCI Plumbing & Mechanical Systems 3