What is the minimum number of portable fire extinguishers required on board a 45-foot uninspected towing vessel having a fixed fire system on board?

Correct Answer: Option B — 2 B-I

Per 46 CFR 25.30-10, uninspected vessels fitted with an approved fixed machinery space fire-extinguishing system are granted a reduction in portable fire extinguisher requirements, requiring only two B-I hand-portable extinguishers in the machinery space.