What is Viking 3250D PAPR?

The Viking 3250D FGS PAPR is one of the systems in Lincoln Electric’s Viking-branded welding powered air respirator (PAPR) line, built around the Viking 3350 welding helmet platform. Lincoln offers this line in two battery configurations — a standard-battery system (K3930-4) and an extended-battery system (K3930-6) — plus the separate Viking 3350 XG PAPR helmet (KP4638-1).

Per Lincoln’s own publication (EE14.747), the system is NIOSH-approved under 42 CFR 84 as a loose-fitting PAPR with an Assigned Protection Factor (APF) of 25. It uses three-stage filtration: a spark screen (KP3936-1), a pre-filter (KP3935-1), and a HEPA filter (KP3424-2). Batteries are Li-ion, rated for 500 charge cycles: the standard battery (KP3937-1) gives roughly 9 hours’ runtime at 180 l/min with a 3-hour charge, while the extended battery (KP3938-1) gives roughly 16 hours with a 4.5-hour charge.

Because this is a NIOSH-approved respiratory system, only use the manufacturer-specified filter stack and battery for your exact model, and check your unit’s own approval label rather than assuming parts are interchangeable across Viking generations.