Dometic Fan-Tastic Vent 3350 rain-sensor and control prep

Use the official Dometic 3350 product page to identify model, rain sensor, thermostat, and reversible-airflow support details.

Owner-safe checklist

Record the 3350 model or SKU, control state, thermostat setting, fan direction, lid state, and rain-sensor behavior.
Save photos of the visible label, controls, lid state, and the condition that triggered the support question.
Use Dometic, a dealer, or qualified RV service for powered fan, roof, mounted parts, or replacement decisions.