Durable Construction: High-grade insulation protects against abrasion and heat degradation in the burner compartment

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Reznor 104842 Pressure Switch Els PW 17895 Durable Construction: High-grade insulation protectsThe Reznor 104842 Pressure Switch is a critical safety component designed for combustion air proving in specialized industrial heating equipment, including Reznor waste oil heaters and Venturion models. Engineered to monitor the differential pressure within the induced draft assembly, this air pressure switch (often cross referenced as FS3440 894) ensures that proper venting is established before allowing the burner to cycle. By verifying airflow