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

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A condensing (Category IV) furnace is connected to a Type B gas vent that also serves a draft-hood water heater. What should the inspector do?

Approve the common vent because both appliances burn natural gas Approve it in dwellings under 3,000 square feet Approve it if the B vent is increased one pipe size Reject it; Category IV appliances operate with positive vent pressure and produce condensate and shall not be common-vented into a Type B vent serving a Category I appliance

Correct Answer:

Reject it; Category IV appliances operate with positive vent pressure and produce condensate and shall not be common-vented into a Type B vent serving a Category I appliance

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