$726,000 Bathroom-Fan Fire Claim Fails on Expert Proof
The First Circuit affirmed judgment for bathroom-fan manufacturers because the insurer’s admissible expert evidence did not establish a manufacturing deviation or a feasible safer design.
Case record
Authority before analysis.
Court
U.S. Court of Appeals for the First Circuit
Docket
No. 25-1426
Decision
August 28, 2026
Posture
Appeal from summary judgment for the manufacturers in a property insurer’s subrogation action alleging negligence and breach of implied warranty.
Status
Published, precedential federal appellate opinion; district-court judgment affirmed.
01
What the court did
After paying approximately $726,000 for a residential fire allegedly originating in a bathroom exhaust fan, Citation Insurance sued the fan and motor manufacturers. The First Circuit held that the admissible expert evidence did not identify how the fan departed from its intended design or establish the feasibility and cost of a safer alternative design. New opinions offered during the expert’s deposition had been excluded because they were not adequately disclosed in his Rule 26 report.
02
Why operators should care
Fire-loss litigation can turn on immediate evidence preservation, coordinated inspections, product identification, installation and maintenance records, and a complete expert report that clearly separates manufacturing, design, installation, and maintenance theories.
03
What remains unresolved
There is no remand. The court did not hold that the fan was defect-free or determine the fire’s actual cause. It also declined to decide whether Massachusetts generally recognizes the malfunction theory of product liability.
Industries
Home servicesHVACManufacturersResidential construction
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