NM Mechanical Inspector Practice Questions - New Mexico CID Mechanical Inspector Examination Exam

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A flexible supply duct is pulled through a 4-inch hole so the 8-inch duct is crushed to about half its diameter for 6 feet. What is the inspection result?

Approve it; crushing improves velocity Reject it; flexible ducts must be installed at their full listed diameter so the free area is not reduced Approve it if the furnace blower is on high speed Approve it in unconditioned attics only

Correct Answer:

Reject it; flexible ducts must be installed at their full listed diameter so the free area is not reduced

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