Red Seal Oil Heat System Technician Practice Exam 2025 - Free Oil Heat System Technician Practice Questions and Study Guide Flash Cards

Question: 1 / 400

What could cause an oil furnace to produce excessive smoke?

?

Clogged nozzles, improper air adjustment, or incorrect fuel oil viscosity

Next
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy